I checked the Grandmaster Duke website, which also lists one. I got confused about this before, I think one is just a foreign title to the same flick. I also got this e-mail.

Dear XPT,
Duke Floored is never incorrect in his writings.
Sincerely,
Mark Wallice (RIP acc. Smelly Monkey )

I guess the point is...I don't think it's 60%, otherwise over 50 titles would now be legal. Nice to ponder though. Make you wanna browse some Euro video distributors...