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"""
US Population: Wrapped Facet
============================
This chart visualizes the age distribution of the US population over time,
using a wrapped faceting of the data by decade.
"""
# category: case studies
import altair as alt
from vega_datasets import data
source = data.population.url
alt.Chart(source).mark_area().encode(
x='age:O',
y=alt.Y(
'sum(people):Q',
title='Population',
axis=alt.Axis(format='~s')
),
facet=alt.Facet('year:O', columns=5),
).properties(
title='US Age Distribution By Year',
width=90,
height=80
)
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