<P> Yakuza groups in 1990 were estimated to number more than 3,300 and together contained more than 88,000 members . Although concentrated in the largest urban prefectures, yakuza operate in most cities and often receive protection from highranking officials . After concerted police pressure in the 1960s, smaller gangs either disappeared or began to consolidate in syndicate - type organizations . In 1990, three large syndicates (Yamaguchi - gumi, Sumiyoshi - kai, Inagawa - kai) dominated organized crime in the nation and controlled more than 1,600 gangs and 42,000 gangsters . Their number have since swelled and shrunk, often coinciding with economic conditions . </P> <P> The yakuza tradition also spread to the Okinawa Island in the 20th century . The Kyokuryu - kai and the Okinawa Kyokuryu - kai are the two largest known yakuza groups in Okinawa Prefecture and both have been registered as designated boryokudan groups under the Organized Crime Countermeasures Law since 1992 . </P> <P> Beginning in 2013, the National Police Agency re-classified the Chinese Dragons, Kento Rengo, and bōsōzoku biker gangs as "pseudo-yakuza" organizations . </P> <P> In 1989 Japan experienced 1.3 robberies and 1.1 murders per 100,000 population . In the same year, Japanese authorities solved 75.9% of robberies and 95.9% of homicides . </P>

What is the crime rate in various parts of japan