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"""
Cumulative Wikipedia Donations
==============================
This chart shows cumulative donations to Wikipedia over the past 10 years. Inspired by this `Reddit post <https://www.reddit.com/r/dataisbeautiful/comments/7guwd0/cumulative_wikimedia_donations_over_the_past_10/>`_ but using lines instead of areas.
"""
# category: case studies
import altair as alt
source = "https://frdata.wikimedia.org/donationdata-vs-day.csv"
alt.Chart(source).mark_line().encode(
alt.X('monthdate(date):T', title='Month', axis=alt.Axis(format='%B')),
alt.Y('max(ytdsum):Q', title='Cumulative Donations', stack=None),
alt.Color('year(date):O', legend=alt.Legend(title='Year')),
alt.Order('year(data):O')
)
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