I keep a spreadsheet of hikes (highpoints, other significant hikes). Turns out I did almost 52K vertically in 2000. Otherwise I've been consistently in the 42K-49K range. In 2002 I had a total of 49,990 vertical feet... If I'd known that I would have found me a small 10' hill to bag!
I hike Camelback and Squaw/Piestewa Peaks in Phoenix all the time, each with about 1,200' of gain, but do not include these in with my spreadsheet. So it's probably safe to assume that in some years I have exceeded 75K - 80K. I hadn't thought about the yearly figures. Good question. No wonder my legs hate me.