How to remember the number of stars received per level?

Question

Unity

The problem is this. I will have many levels in the game, and in each of them stars will be given for quickly completed levels - the faster, the more stars. But here's the whole point of the question. How do I remember these stars?
Let's say there are 100 levels. And if I implement everything through PlayerPrefs, then I will have to make scripts for each level, and make a huge bunch of variables and remember them in PlayerPrefs. I'm sure there is a way to solve this somehow. Help:)