Нормализованная диаграмма с областями и накоплением

import altair as alt
from altair.datasets import data

source = data.iowa_electricity()

alt.Chart(source).mark_area().encode(
    x="year:T",
    y=alt.Y("net_generation:Q").stack("normalize"),
    color="source:N"
)

import altair as alt
from altair.datasets import data

source = data.iowa_electricity()

alt.Chart(source).mark_area().encode(
    x="year:T",
    y=alt.Y("net_generation:Q", stack="normalize"),
    color="source:N"
)