All figures are 'courtesy of' (stolen from) chart archive site zobbel.de and account for the Top 200 singles chart (apart from the first two months of 2006, which extend as far as the Top 250). To be honest it'd probably better if they only went down to 40, wouldn't it.
The stats for 2011 are yet to be revealed, but you can be sure that when they are there'll be basis for a spurious and extrapolative article in The Guardian.
UPDATE: There were 952 new entries into the Top 200 in 2011.
AND AGAIN: There were 927 new entries into the Top 200 in 2012.