From a lecturer to a researcher: a three-stage process of science teachers’ professional development in mainland China

Asia-Pacific Science Education

Table 1 Student number in the schools in different year (ten thousand)

School	1949	1998	2018
Primary School	2439	13,954	10,339
Middle School	95	5363	4653
High School	32	938	3935
Special Education	0	36	66