It also depends upon where you live. I live in Colorado. During the summer I get in 25 to 30 dives during training and certification weekends, and Debbie and I usually get 2 dive trips in per year, sometimes more (4 is our record: Florida, Fiji, Cozumel and Hawaii all in one year- a GREAT YEAR) sometimes less (but always at least one). If I get 50 dives in during a calendar year at this point in my life, it's a pretty good year. That does not count about 100 hours of pool time. If I lived in Florida or the Carolinas or Hawaii, even California, I'd get in more- at least twice as many, for sure.
The important thing is to be an active diver, whether that is 25 dives a year or 200. And sorry, cbrich, but I think everyone should log their dives. Lots of personal data can be accumulated that is of great use, including time per dive and total hours under water, which I do agree is an important stat as well.
DivemasterDennis