I love this graph, which shows bicycle casualties going down even as ridership goes up substantially.
I've always believed in the safety-in-numbers argument. When drivers are expecting cyclists, all cyclists are safer.
A digression: I shouldn't mention the H***** word, but the "safety in numbers" argument is why I oppose mandatory helmet laws, even though I always wear a helmet. Mandatory helmet laws seem to discourage cycling (there's decent evidence from Down Under on this). Less cycling means that I'm less safe, helmet or no helmet.