The amount is proportional to the upvoter SP
FYI right now it's not proportional, there's a bias towards concentraring SP on a single account, so for example one single upvote from @abit ( 3 mio SP) is around 6$ , one single upvote from @transisto ( 1 mio SP ) is just about 1$
Whatever that algorithm or that bias is right now, it should be doubled with an equal amount, that's what the proposal is about, but thanks for the comment.