How many hashes create one Bitcoin? Irrespective of the length of time required to calculate one hash, how many hash operations are required to produce one Bitcoin?
These charts show the approximate network hash rate on the left axis:
  http://bitcoin.sipa.be/

We know the network adjusts for 25 new bitcoins per 10 minutes.

Together this provides enough info to give an approximate answer to your question:

hashes per bitcoin 
= (network hash rate) / (25 BTC per 10 minutes)
= (180 * Th / s) / (25 * BTC / (600 * s) )
= 180 * 600 / 25 * Th / s / BTC * s
= 2,700 Th / BTC
= 2,700,000,000,000,000 h/BTC