The proportion of junior middle schools in Japan is only 42.5% in 1950, 57.7% in 1960, 82. 1% in 1970, 94.2% in 1980, and 1990. The quasi-compulsory education of senior high school education has been realized.

If 100% is universal, then Japan has not yet, and there is no country in time.

According to the general popularization method, it was basically popularized in the 1980 s.