Per year eh? Hmm, I probably bought like 10 previous year, let's see...
Assuming Portal 2 was still 2011, I bought that.
I bought Terraria and Minecraft. I bought Starcraft 2 just before new year.
I bought Oblivion to see if Skyrim would perhaps interest me, and played it for like 1 hour total.
I bought Portal 1 and Bastion.
I bought some stupid tower defense game for like 5 bucks.
And probably bought something else as well. And this year, I know I will be buying a lot as well. Already bought Tera, will be buying Heart of the Swarm if it comes out, will be buying MoP, gonna buy Guild Wars 2, gonna buy MoP, gonna get D3 for free due to Annual Pass, dunno if I can count that. And then any other indie games or awesome games I might bump into, or a really cheap game on steam sale... I think I willl click the 10 button, or 10+.