Steem has given out approximately $60 million in rewards from mid 2016 to today. The website steem.com shows $59,595,935 but that hasn't updated since its creation (and tbh looks like someone didn't hear the full amount and had to make up the rest.) This account is one of the latest to have been created, number 1,208,159.
60,000,000 / 1,208,159 = $49,66 per account.
Now considering how many accounts are never used, how wide Steem has been distributed over the years I'd say the real average is a lot higher.
What have the other platforms rewarded you with in the last 2.5 years?