Mystery Chart

The chart is real.
Its title is redacted.

Five charts a day, all built from live public data. Everything is there except the one label that tells you what you're looking at.

1. Only the title is hidden Every country, year and number is exactly as published.
2. Work out what it measures The chart is the only evidence you get. Pick the title you think belongs on it.
3. A wrong answer buys a hint Hints start cryptic and end obvious. Ask for one early if you like; it costs the same.
4. The harder charts are worth more Naming the last chart first time is worth triple the first, and a clean sweep pays a bonus on top. There's no clock.

Data from Our World in Data, the World Bank, WHO and Eurostat