Great question. I could get you an exact number tomorrow probably but I'd have to say I averaged 3 a week in 2013. That's a total guess but I bet I acquired 150 cards I needed this year.
If Topps stoops placing him in products, it'll slow down drastically. But that's my guess.
It usually comes in batches though. Five cards here. Ten cards there. Bought out a few Belle guys this year, so that helped. Owning 89% of all cards makes it tough to get anything new but I have two cards incoming as we speak, so there are cards I need.
(Sorry for the long winded response but appreciate the question!)
Thanks for the detail! Are most of the ones you tend to buy more recent releases, then? When I discount recent releases with Gomes, the last card I bought that I needed was in April of 2012---and before that, October of 2009. With his new releases (48 so far this year, 18 last year), though, I tend to have a spate of packages awaiting me when I go home.
How many 1/1s does Belle have (and does the 89% include them)?