For the Bachelor, its 1 out of 22 (Jason doesn't count as he dumped Molly and then got back together with her), so yeah, about 5%.
For the Bachelorette, its 3 married and 3 engaged out of 13, so nearly half are either married to their final 1 or at least still engaged to them.
Crazy difference of success/failures of the two shows.
And don't worry, I used wikipedia to look this all up, so I haven't lost it and remembered off the top of my head!