Fun with graphs

I dare you to look at this graph and not have this song in your head for the rest of the day.

Okay, sorry. I know rickrolling is like, so last year*, but a student showed me this and it took me like a week to kill the worm. And we all know the rule: Chris does not suffer alone. Plus, it's a pie chart. And I love pie.

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* I also realize that "so last year" is like, so five years ago. And the "like" thing started in the 1980's, when the Internet had about 5 users. I'm old, I can't help it. You're lucky I didn't say it was groovy.