The unofficial (chefarztfrau) Website lists 472 PML cases as of June 4, 2014 (470 of them with MS, 2 with Crohn's disease) worldwide.
Of these, 151 have been in the US, 281 in Europe, and 40 in the rest of the world.
23% of the PML patients have died. The overall PML incidence as of June 4, 2014, is 3.64 per 1,000 patients
As of March 31, 2014, approximately 125,800 patients received Tysabri in the post-marketing setting worldwide.
http://chefarztfrau.de/?page_id=716