The numbers you are probably referring to are for the market share in any given year.

https://www.jckonline.com/magazine-article/the-knot-2019-jew...

Since people tend to stay married for years, and tungsten wasn't as popular previously, the actual number of adult men wearing tungsten wedding bands is probably a lot lower, maybe around 10%.

Still a lot. Approximately nobody wears them in Germany; seems like an opportunity.