Well, as Hans won 22 World Championships (of various kinds), which is a clear five ahead of any other rider, not many.
The 1985 World Pairs Final - for which Tommy Knudsen was selected instead of Hans at the height of the feud.
And maybe the 1985 World Final at Bradford - when Knudsen seemed to be under instruction (you would assume from Olsen) to mess up Nielsen in his fourth ride.
That's probably it.
All the best
Rob