Area Chart

from altair import *

Chart('https://vega.github.io/vega-lite/data/unemployment-across-industries.json').mark_area().encode(
    x=X('date:T',
        axis=Axis(
            axisWidth=0.0,
            format='%Y',
            labelAngle=0.0,
        ),
        scale=Scale(
            nice='month',
        ),
        timeUnit='yearmonth',
    ),
    y='sum(count):Q',
).configure_cell(
    height=200.0,
    width=300.0,
)