I have the data here. In the past five years, there were 656 prosecutions, of which 479 cases culminated in convictions. In all, there were 502 sentences or convictions. The figures do not match because often, in the same prosecution, there may be two convictions, but that gives you an idea of the number of prosecutions that ended up before the courts in the past five years.
On March 26th, 2009. See this statement in context.