Trellis Stacked Bar Chart

This is an example of a horizontal stacked bar chart using data which contains crop yields over different regions and different years in the 1930s.

import altair as alt
from vega_datasets import data

barley = data.barley()

alt.Chart(barley).mark_bar().encode(
    column='year',
    x='sum(yield)',
    y='variety',
    color='site'
).properties(
    width=250
)