UK-based Aerospace magazine, 'Flight International', has published a compendium of aircraft & helicopter types & total number in service with Armed Forces of each country for the year 2012-2013.
This annual initiative is provided as a supplement with the magazine. If you aren't a subscriber, you can still read it, as they've made it available to download for free. Click on the image below to reach the download page. You will have to fill in some information, following which they would provide you with the download link.
via The DEW Line