Display part-to-whole patterns over time.
https://depictdatastudio.com/charts/stacked-area/
Example 1
Source:squarespace
Example 2
Obama wants community college to be free (or nearly) for anyone. Here's how much college costs have skyrocketed
Additionally, people attending two- and four-year colleges have steadily risen
Source: twitter
Example 3
Measuring the Trump bump Donald Trump boosts the media exposure of his fellow heads of state, for better or worse
Source: economist
Example 4
The space race is dominated by new contenders
Private businesses and rising powers are replacing the cold-war duopoly