okr on 01 December 2012
You don't have to estimate first year sales, they're avalailable for all games on this very site,
As listing of top 100 for e.g. 2008:
http://www.vgchartz.com/yearly/2008/Global/ (in this example all yellow games were released in 2008)
Or altenatively on the individual game sites under global/yearly, e.g. http://www.vgchartz.com/game/12390/littlebigplanet/Global/
Edit: ignore my post, I just saw you mean sales of first 52 weeks on the market, not just sales within year of release.
