I don't consider the number of proving cases of fraud to be useful in this discussion. It is extremely difficult in most jurisdictions where the fraud is occurring to get the DA to prosecute--even assuming you can get the relevant authorities to pursue enough of a case for the DA to have a shot. If you do so, you are unlikely to get a conviction. Yeah, the corrupt people that are doing the fraud are the people in power and you expect us to take lack of convictions as critical to the discussion? That's taking disingenuous to a new level.
Here's a fact: Nowhere gets 100% voter participation. Here's another fact: There are almost 400 documented cases in the last few years where a registration board reported voting that exceeded 100% of the registered voters. Ergo, massive fraud was committed in those areas. The lack of convictions proves my point above. There's a lot more that push right up to that 100% number but are mathematically literate enough to not quite go over. That's not even counting systematically removed votes, such as the multiple times where boards have not counted military ballots in a close election. (No, I'm not talking the usual case where absentees are not counted if the total number is not enough to change the count. See 2000 Florida.)
Note that the "registered voter commits fraud" is a tiny percentage of the fraud. Much of it is illegal aliens voting as non-citizens, but even more is likely the so called "stuffed" ballot boxes, though what constitutes "stuffed" is a little more technically tricky now than when the term was coined. As with the 2016 Michigan recount, when they stopped the recount when they discovered that the vote tallies in certain areas vastly inflated the number of ballots in the box. That is, it wasn't that a group of people conspired to make fraudulent votes but rather that the election monitoring officials simply lied about the count. A classic case of Stalin's voting statement.
There is a deep history of voting fraud in this country, going back to at least 1840's Florida. Miami-Dade was producing the numbers "needed" even back then. Some federal investigators ended up in the swamp and never came out again over that one. Yep, it goes back that far. It hasn't been all one party, but it has been mostly one party. Most of the Republican fraud is in the 1870-1890 range, notable for almost complete, sustained power over a lot of areas. Power corrupts. Democrats have absolute power in a lot of places for a long time, and it happens to correspond very tightly with those 100%+ voter "turnout" areas.
So let's cut to the chase and lay off the disingenuous crap.