Highest diploma

1997

2000

2004

2006

2009

2011

Primary school

14.83

13.69

9.21

8.48

9.3

7.38

Junior middle school

40.13

39.61

32.33

31.98

36.99

28.33

Senior high school

24.45

24.93

25.3

22.14

20.35

18.71

Technical school

9.43

10.2

18.11

17.44

14.76

12.82

Junior college and undergraduate

4.98

7.38

12.73

16.57

14.97

28.66

Master degree and above

0.08

0.11

0.05

0.1

0.21

1.38