With 13% increase of hashrate 333MHash/s gives approximately 0.12/(1+0.13/2)=BTC0.11
Furthermore, the difficulty nowadays changes not in 14-days period, but in 12-days { more precisely in 14/(1+0.13) }.
So you can make BTC0.11*(1-0.885^30)/(1-0.885)=BTC0.932 in one year.
13% is a very optimistic view. The last 10 difficulty increases have been roughly 20% per adjustment.