JavaScript chart by amCharts 3.21.15
20
20
25
30
25
35
17
20
18
22
28-40
36-50
1967
1981
1985
1986
1993
1995
2000
2004
2007
2009
2014
2018
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38