I had ten or more in 2008; I can't find the list (D*mn these computers with their near-infinite disk space)
2009: 4 punctures.
2010: 2 punctures.
2011: 1 puncture (so far)
I've no idea what's causing the reduction. Now using Schwalbe Marathons on almost all my bikes; and the new vehicles (Trek Soho, Genesis Day-One Alfine) haven't featured in the list of shame at all.
Commuting, Day rides, Audax, Incidents, etc.