From: Historical insights into British, Japanese and US general science from the first half of the twentieth century
1st Oct. Year
No. of schools (No. of students)
1913
1,148 (210,193)
1921
1,482 (408,635)
1925
1,613 (424,824)
1928
1,691 (457,085)
1932
1,756 (514,916)
1936
1,787 (554,615)
1937
1,794 (558,097)