25% of total members worldwide, i can see. But for adults who are active members I can easily see the number be higher.
Also, they have relaxed situational requirements (not worthiness requirements) in the last 20 years or so to get more people to go through partly because it IS harder to leave once you go through.
For example, I have a friend who is LDS and married outside the temple to an LDS man (who was not worthy at the time). Her Bishop approved her to go through without her husband because her husband made no signs after 5 years of marriage to get back to being ‘worthy’ to take her to the temple.
I also had another friend who was an older widow (convert) and she went to the Temple right after her one year date because she had no intention of getting married again and wanted the work done for her husband.
Only 35% of LDS members world wide are active in the church at all, from some recent estimates.
You might be surprised at how few ward members actually hold or have held Temple Recommends. I doubt if it is 1/2 of the adults. This is information I received from my brother who is serving in his Bishopric.