AdMob has released their May 2009 statistics. Each month they put out a monthly report based on the number of requested ad impressions from their now 7,000 mobile publishers (plus mobile apps). April stats showed that Canada had increased our number of requests by 2.2% to a total of 168,336,971 impressions. In May we decreased by 0.1% with a total of 167,150,242 total impression – but kept our 6th place. I’m sure this will increase in June with the introduction of the iPhone 3GS.
More here at AdMob