Hard to say really...
I'm pretty sure I've been riding > 200 miles a year since I was about 10 or so. At least almost every year.
I've done bike commuting off and on for most of my adult life, but perhaps 50% by bike, and somewhere between 5 to 10 miles each way. Although that included mostly climbing a mountain in the late 90's.
Anyway, I think I had estimated in the past that my average annual mileage was somewhere between 1000 and 2000 miles. Give or take a bit.
Mileage has bumped up somewhat over the last couple of years, with about 5000 miles in 2016 and 6000 miles in 2017. I'm expecting 2018 to be 7000+ miles if I don't have any major injuries.