# best fit: Y = -106.6 + 0.06 X
# covariance matrix:
# [ 39602, -19.9
#   -19.9, 0.01]
# chisq = 0.8
data: 1970 12 3.16228
data: 1980 11 2.23607
data: 1990 14 1.82574
data: 2000 13 1.58114

fit: 1961 11.06
hi : 1961 14.1276
lo : 1961 7.99243
fit: 1961.3 11.078
hi : 1961.3 14.1172
lo : 1961.3 8.03877
fit: 1961.6 11.096
hi : 1961.6 14.1069
lo : 1961.6 8.08509
fit: 1961.9 11.114
hi : 1961.9 14.0966
lo : 1961.9 8.13137
fit: 1962.2 11.132
hi : 1962.2 14.0864
lo : 1962.2 8.17761
fit: 1962.5 11.15
hi : 1962.5 14.0762
lo : 1962.5 8.22383
fit: 1962.8 11.168
hi : 1962.8 14.066
lo : 1962.8 8.27
fit: 1963.1 11.186
hi : 1963.1 14.0559
lo : 1963.1 8.31614
fit: 1963.4 11.204
hi : 1963.4 14.0458
lo : 1963.4 8.36224
fit: 1963.7 11.222
hi : 1963.7 14.0357
lo : 1963.7 8.4083
fit: 1964 11.24
hi : 1964 14.0257
lo : 1964 8.45432
fit: 1964.3 11.258
hi : 1964.3 14.0157
lo : 1964.3 8.5003
fit: 1964.6 11.276
hi : 1964.6 14.0058
lo : 1964.6 8.54624
fit: 1964.9 11.294
hi : 1964.9 13.9959
lo : 1964.9 8.59213
fit: 1965.2 11.312
hi : 1965.2 13.986
lo : 1965.2 8.63798
fit: 1965.5 11.33
hi : 1965.5 13.9762
lo : 1965.5 8.68378
fit: 1965.8 11.348
hi : 1965.8 13.9665
lo : 1965.8 8.72953
fit: 1966.1 11.366
hi : 1966.1 13.9568
lo : 1966.1 8.77523
fit: 1966.4 11.384
hi : 1966.4 13.9471
lo : 1966.4 8.82088
fit: 1966.7 11.402
hi : 1966.7 13.9375
lo : 1966.7 8.86647
fit: 1967 11.42
hi : 1967 13.928
lo : 1967 8.91201
fit: 1967.3 11.438
hi : 1967.3 13.9185
lo : 1967.3 8.9575
fit: 1967.6 11.456
hi : 1967.6 13.9091
lo : 1967.6 9.00292
fit: 1967.9 11.474
hi : 1967.9 13.8997
lo : 1967.9 9.04828
fit: 1968.2 11.492
hi : 1968.2 13.8904
lo : 1968.2 9.09358
fit: 1968.5 11.51
hi : 1968.5 13.8812
lo : 1968.5 9.13882
fit: 1968.8 11.528
hi : 1968.8 13.872
lo : 1968.8 9.18399
fit: 1969.1 11.546
hi : 1969.1 13.8629
lo : 1969.1 9.22908
fit: 1969.4 11.564
hi : 1969.4 13.8539
lo : 1969.4 9.27411
fit: 1969.7 11.582
hi : 1969.7 13.8449
lo : 1969.7 9.31906
fit: 1970 11.6
hi : 1970 13.8361
lo : 1970 9.36393
fit: 1970.3 11.618
hi : 1970.3 13.8273
lo : 1970.3 9.40872
fit: 1970.6 11.636
hi : 1970.6 13.8186
lo : 1970.6 9.45343
fit: 1970.9 11.654
hi : 1970.9 13.8099
lo : 1970.9 9.49805
fit: 1971.2 11.672
hi : 1971.2 13.8014
lo : 1971.2 9.54259
fit: 1971.5 11.69
hi : 1971.5 13.793
lo : 1971.5 9.58703
fit: 1971.8 11.708
hi : 1971.8 13.7846
lo : 1971.8 9.63137
fit: 1972.1 11.726
hi : 1972.1 13.7764
lo : 1972.1 9.67561
fit: 1972.4 11.744
hi : 1972.4 13.7683
lo : 1972.4 9.71975
fit: 1972.7 11.762
hi : 1972.7 13.7602
lo : 1972.7 9.76378
fit: 1973 11.78
hi : 1973 13.7523
lo : 1973 9.80769
fit: 1973.3 11.798
hi : 1973.3 13.7445
lo : 1973.3 9.85149
fit: 1973.6 11.816
hi : 1973.6 13.7368
lo : 1973.6 9.89517
fit: 1973.9 11.834
hi : 1973.9 13.7293
lo : 1973.9 9.93872
fit: 1974.2 11.852
hi : 1974.2 13.7219
lo : 1974.2 9.98213
fit: 1974.5 11.87
hi : 1974.5 13.7146
lo : 1974.5 10.0254
fit: 1974.8 11.888
hi : 1974.8 13.7075
lo : 1974.8 10.0685
fit: 1975.1 11.906
hi : 1975.1 13.7005
lo : 1975.1 10.1115
fit: 1975.4 11.924
hi : 1975.4 13.6936
lo : 1975.4 10.1544
fit: 1975.7 11.942
hi : 1975.7 13.687
lo : 1975.7 10.197
fit: 1976 11.96
hi : 1976 13.6805
lo : 1976 10.2395
fit: 1976.3 11.978
hi : 1976.3 13.6741
lo : 1976.3 10.2819
fit: 1976.6 11.996
hi : 1976.6 13.668
lo : 1976.6 10.324
fit: 1976.9 12.014
hi : 1976.9 13.6621
lo : 1976.9 10.3659
fit: 1977.2 12.032
hi : 1977.2 13.6563
lo : 1977.2 10.4077
fit: 1977.5 12.05
hi : 1977.5 13.6508
lo : 1977.5 10.4492
fit: 1977.8 12.068
hi : 1977.8 13.6455
lo : 1977.8 10.4905
fit: 1978.1 12.086
hi : 1978.1 13.6404
lo : 1978.1 10.5316
fit: 1978.4 12.104
hi : 1978.4 13.6355
lo : 1978.4 10.5725
fit: 1978.7 12.122
hi : 1978.7 13.6309
lo : 1978.7 10.6131
fit: 1979 12.14
hi : 1979 13.6266
lo : 1979 10.6534
fit: 1979.3 12.158
hi : 1979.3 13.6225
lo : 1979.3 10.6935
fit: 1979.6 12.176
hi : 1979.6 13.6188
lo : 1979.6 10.7332
fit: 1979.9 12.194
hi : 1979.9 13.6153
lo : 1979.9 10.7727
fit: 1980.2 12.212
hi : 1980.2 13.6121
lo : 1980.2 10.8119
fit: 1980.5 12.23
hi : 1980.5 13.6093
lo : 1980.5 10.8507
fit: 1980.8 12.248
hi : 1980.8 13.6068
lo : 1980.8 10.8892
fit: 1981.1 12.266
hi : 1981.1 13.6047
lo : 1981.1 10.9273
fit: 1981.4 12.284
hi : 1981.4 13.6029
lo : 1981.4 10.9651
fit: 1981.7 12.302
hi : 1981.7 13.6016
lo : 1981.7 11.0024
fit: 1982 12.32
hi : 1982 13.6006
lo : 1982 11.0394
fit: 1982.3 12.338
hi : 1982.3 13.6001
lo : 1982.3 11.0759
fit: 1982.6 12.356
hi : 1982.6 13.6
lo : 1982.6 11.112
fit: 1982.9 12.374
hi : 1982.9 13.6004
lo : 1982.9 11.1476
fit: 1983.2 12.392
hi : 1983.2 13.6013
lo : 1983.2 11.1827
fit: 1983.5 12.41
hi : 1983.5 13.6027
lo : 1983.5 11.2173
fit: 1983.8 12.428
hi : 1983.8 13.6046
lo : 1983.8 11.2514
fit: 1984.1 12.446
hi : 1984.1 13.6071
lo : 1984.1 11.2849
fit: 1984.4 12.464
hi : 1984.4 13.6101
lo : 1984.4 11.3179
fit: 1984.7 12.482
hi : 1984.7 13.6138
lo : 1984.7 11.3502
fit: 1985 12.5
hi : 1985 13.618
lo : 1985 11.382
fit: 1985.3 12.518
hi : 1985.3 13.6229
lo : 1985.3 11.4131
fit: 1985.6 12.536
hi : 1985.6 13.6285
lo : 1985.6 11.4435
fit: 1985.9 12.554
hi : 1985.9 13.6348
lo : 1985.9 11.4732
fit: 1986.2 12.572
hi : 1986.2 13.6418
lo : 1986.2 11.5022
fit: 1986.5 12.59
hi : 1986.5 13.6495
lo : 1986.5 11.5305
fit: 1986.8 12.608
hi : 1986.8 13.658
lo : 1986.8 11.558
fit: 1987.1 12.626
hi : 1987.1 13.6672
lo : 1987.1 11.5848
fit: 1987.4 12.644
hi : 1987.4 13.6772
lo : 1987.4 11.6108
fit: 1987.7 12.662
hi : 1987.7 13.6881
lo : 1987.7 11.6359
fit: 1988 12.68
hi : 1988 13.6998
lo : 1988 11.6602
fit: 1988.3 12.698
hi : 1988.3 13.7123
lo : 1988.3 11.6837
fit: 1988.6 12.716
hi : 1988.6 13.7258
lo : 1988.6 11.7062
fit: 1988.9 12.734
hi : 1988.9 13.74
lo : 1988.9 11.728
fit: 1989.2 12.752
hi : 1989.2 13.7552
lo : 1989.2 11.7488
fit: 1989.5 12.77
hi : 1989.5 13.7712
lo : 1989.5 11.7688
fit: 1989.8 12.788
hi : 1989.8 13.7882
lo : 1989.8 11.7878
fit: 1990.1 12.806
hi : 1990.1 13.806
lo : 1990.1 11.806
fit: 1990.4 12.824
hi : 1990.4 13.8248
lo : 1990.4 11.8232
fit: 1990.7 12.842
hi : 1990.7 13.8444
lo : 1990.7 11.8396
fit: 1991 12.86
hi : 1991 13.865
lo : 1991 11.855
fit: 1991.3 12.878
hi : 1991.3 13.8864
lo : 1991.3 11.8696
fit: 1991.6 12.896
hi : 1991.6 13.9087
lo : 1991.6 11.8833
fit: 1991.9 12.914
hi : 1991.9 13.9319
lo : 1991.9 11.8961
fit: 1992.2 12.932
hi : 1992.2 13.9559
lo : 1992.2 11.9081
fit: 1992.5 12.95
hi : 1992.5 13.9808
lo : 1992.5 11.9192
fit: 1992.8 12.968
hi : 1992.8 14.0065
lo : 1992.8 11.9295
fit: 1993.1 12.986
hi : 1993.1 14.0329
lo : 1993.1 11.9391
fit: 1993.4 13.004
hi : 1993.4 14.0602
lo : 1993.4 11.9478
fit: 1993.7 13.022
hi : 1993.7 14.0883
lo : 1993.7 11.9557
fit: 1994 13.04
hi : 1994 14.117
lo : 1994 11.963
fit: 1994.3 13.058
hi : 1994.3 14.1465
lo : 1994.3 11.9695
fit: 1994.6 13.076
hi : 1994.6 14.1767
lo : 1994.6 11.9753
fit: 1994.9 13.094
hi : 1994.9 14.2076
lo : 1994.9 11.9804
fit: 1995.2 13.112
hi : 1995.2 14.2391
lo : 1995.2 11.9849
fit: 1995.5 13.13
hi : 1995.5 14.2713
lo : 1995.5 11.9887
fit: 1995.8 13.148
hi : 1995.8 14.304
lo : 1995.8 11.992
fit: 1996.1 13.166
hi : 1996.1 14.3374
lo : 1996.1 11.9946
fit: 1996.4 13.184
hi : 1996.4 14.3713
lo : 1996.4 11.9967
fit: 1996.7 13.202
hi : 1996.7 14.4057
lo : 1996.7 11.9983
fit: 1997 13.22
hi : 1997 14.4407
lo : 1997 11.9993
fit: 1997.3 13.238
hi : 1997.3 14.4761
lo : 1997.3 11.9999
fit: 1997.6 13.256
hi : 1997.6 14.512
lo : 1997.6 12
fit: 1997.9 13.274
hi : 1997.9 14.5484
lo : 1997.9 11.9996
fit: 1998.2 13.292
hi : 1998.2 14.5852
lo : 1998.2 11.9988
fit: 1998.5 13.31
hi : 1998.5 14.6224
lo : 1998.5 11.9976
fit: 1998.8 13.328
hi : 1998.8 14.6601
lo : 1998.8 11.9959
fit: 1999.1 13.346
hi : 1999.1 14.6981
lo : 1999.1 11.9939
fit: 1999.4 13.364
hi : 1999.4 14.7364
lo : 1999.4 11.9916
fit: 1999.7 13.382
hi : 1999.7 14.7752
lo : 1999.7 11.9888
fit: 2000 13.4
hi : 2000 14.8142
lo : 2000 11.9858
fit: 2000.3 13.418
hi : 2000.3 14.8536
lo : 2000.3 11.9824
fit: 2000.6 13.436
hi : 2000.6 14.8933
lo : 2000.6 11.9787
fit: 2000.9 13.454
hi : 2000.9 14.9332
lo : 2000.9 11.9748
fit: 2001.2 13.472
hi : 2001.2 14.9735
lo : 2001.2 11.9705
fit: 2001.5 13.49
hi : 2001.5 15.014
lo : 2001.5 11.966
fit: 2001.8 13.508
hi : 2001.8 15.0547
lo : 2001.8 11.9613
fit: 2002.1 13.526
hi : 2002.1 15.0957
lo : 2002.1 11.9563
fit: 2002.4 13.544
hi : 2002.4 15.137
lo : 2002.4 11.951
fit: 2002.7 13.562
hi : 2002.7 15.1784
lo : 2002.7 11.9456
fit: 2003 13.58
hi : 2003 15.2201
lo : 2003 11.9399
fit: 2003.3 13.598
hi : 2003.3 15.262
lo : 2003.3 11.934
fit: 2003.6 13.616
hi : 2003.6 15.3041
lo : 2003.6 11.9279
fit: 2003.9 13.634
hi : 2003.9 15.3463
lo : 2003.9 11.9217
fit: 2004.2 13.652
hi : 2004.2 15.3888
lo : 2004.2 11.9152
fit: 2004.5 13.67
hi : 2004.5 15.4314
lo : 2004.5 11.9086
fit: 2004.8 13.688
hi : 2004.8 15.4742
lo : 2004.8 11.9018
fit: 2005.1 13.706
hi : 2005.1 15.5171
lo : 2005.1 11.8949
fit: 2005.4 13.724
hi : 2005.4 15.5602
lo : 2005.4 11.8878
fit: 2005.7 13.742
hi : 2005.7 15.6034
lo : 2005.7 11.8806
fit: 2006 13.76
hi : 2006 15.6468
lo : 2006 11.8732
fit: 2006.3 13.778
hi : 2006.3 15.6903
lo : 2006.3 11.8657
fit: 2006.6 13.796
hi : 2006.6 15.7339
lo : 2006.6 11.8581
fit: 2006.9 13.814
hi : 2006.9 15.7777
lo : 2006.9 11.8503
fit: 2007.2 13.832
hi : 2007.2 15.8216
lo : 2007.2 11.8424
fit: 2007.5 13.85
hi : 2007.5 15.8656
lo : 2007.5 11.8344
fit: 2007.8 13.868
hi : 2007.8 15.9097
lo : 2007.8 11.8263
fit: 2008.1 13.886
hi : 2008.1 15.9539
lo : 2008.1 11.8181
fit: 2008.4 13.904
hi : 2008.4 15.9982
lo : 2008.4 11.8098
fit: 2008.7 13.922
hi : 2008.7 16.0426
lo : 2008.7 11.8014