I don't have any statistics, but I have some anecdotal evidence. My cousin had rheumatic fever as a child and his heart was damaged. Gradually it got worse. When he was 43 (with two young children) he had his first heart transplant. Last year that heart finally failed and he had his second. Almost 20 years after he would have died, he lives a very good life today enjoying his wife and his grandchildren. Don't turn against the organ donation programs.
Although I am happy for you that your cousin has lived another 20 years it begs the question? At whose expense. Your cousin would have died a 'natural' death as opposed to what is taking place. When a natural death process is not as important as the process to preserve the organ it has to stop. The twisted and bent rules surrounding the entire process, including the legal process, have reinforced my position. This is goulish and I will be carried away by police before I leave a loved one in a hospital bed after death. They won't want the scene they will get from me.