The major baseball power in Asia is Japan, home to professional baseball since 1936 and an amateur baseball powerhouse for decades before that. The major leagues in Japan are the Central League and Pacific League. Prominent competitions are the spring Koshien and summer Koshien for high schoolers and the Japan Series. South Korea is home to the Korea Baseball Organization and has developed significantly as a baseball force since the 1980s. Taiwan, with the Chinese Professional Baseball League, and China, with the China Baseball League, are also home to professional circuits and participants in international competitions. The Asia Series was introduced in 2005 as a way for the four top countries to face off, and they also did so in the World Baseball Classic, starting a year later. Japan and South Korea have also conducted all-star exhibition series in the past.