The Royal Yachting Association (RYA) conduct an annual survey on watersports participation and these figures include participation figures for canoe and kayaking.
Watersports & Leisure Participation Survey 2012
Watersports & Leisure Participation Survey 2011
Watersports & Leisure Participation Survey 2010
Watersports Participation survey 2009
Watersports Participation survey 2008
RYA Watersports Participation survey 2007
RYA Watersports Participation survey 2006
RYA Watersports Participation survey 2005
RYA Watersports Participation survey 2004
RYA Watersports Participation survey 2003