Since it began, how many years has FIVB not been held?

The FIVB Volleyball Men's Club World Championship is an international men's club volleyball competition organised by the Fédération Internationale de Volleyball (FIVB), the sport's global governing body. The competition was first contested in 1989 in Italy. It was not held between 1993 and 2008, but since 2009, the competition has been held every year, and has been hosted by Qatar and Brazil except in 2017 and 2018 where both hosted by Poland.

16 years. 2008-1993+1 = 16.