So it's gone down even unadjusted? Not saying you're lying or anything, but it's just weird if that's the case. F1 is still a very popular global sport. And I don't think Scumacher was the only one raking it in, in those years.
There are several reasons for that: Schumacher had an unmatched following in Germany, his merchandise sold like crazy a few years ago - That was where the majority of his salary was coming from. There was an absolute F1-craze here for several years that since died down. Even though Schumacher came back and Vettel is very successful, F1 viewership has never returned to its heyday and it hasn't it other countries either.
Another reason is that a few years ago, much more manufacturers where involved in Formula One (BMW, Toyota, Honda). Factory teams always pay their drivers best and the competition amongst the manufacturers led to salaries exploding. The slight downturn of interest in F1 and the economic crisis has wiped out most of these programs, only Mercedes & Ferrari are left as big manufacturers who pay big buck. Trust me, my numbers are right, my profession involves motorsport so I know what I´m talking about
That being said, F1 drivers are still off great compared to some of their peers. Tom Kristensen (just to name a driver you most likely know, being Danish and all
) is involved in a form of motorsport that is actually more dangerous than F1 and pays even less. I have no solid numbers here but even including his marketing work for Audi, I highly doubt he takes home more than 2 million a year.