# https://altair-viz.github.io/gallery/line_percent.html

import altair as alt
from vega_datasets import data

source = data.jobs.url

alt.Chart(source).mark_line().encode(
    alt.X("year:O"), alt.Y("perc:Q", axis=alt.Axis(format="%")), color="sex:N"
).transform_filter(alt.datum.job == "Welder")
