This is taken from the list of scheduled games posted to our forum before each Monday for the past year - obviously it doesn't include games arranged on the day... and it is skewed by the club campaigns... but here we go:
20th=: Wings Of War, Bushido, Flames Of War 'Nam, Future War Commander, Kings Of War: 3If you knock off 5 or so from each of Warhammer, WAB and Dreadball, as they were major campaigns/leagues/ladders over the whole year, then the top game is Warmahordes, followed by WAB and Bolt Action.
14th=: Death In The Dark Continent, XWing, Black Powder, Dead's Army, Battlegroup Whatever, Deadzone: 4
12th=: Dux Britanniarum, War And Conquest: 5
10th=: Chain Of Command, Battlefleet Gothic: 6
9th: OldHammer: 8
8th: Judge Dredd: 9
7th: Warhammer 40k: 10
6th: Dystopian Wars: 11
5th: Bolt Action: 21
3rd=: Dreadball, Warhammer Fantasy: 25
2nd: Warmachine/Hordes: 26
1st: Warhammer Ancient Battles: 27
 That's basically knock off 10 for 10 monthly campaign evenings but add 5 back on because the main reason there were campaigns is they were popular games!