1949

0.0

1974

5.0

1964

6.4

1965

4.8

1984

5.3

2000

6.0

1982

7.6

2006

7.0

2017

6.7

1991

6.4

2006

7.2

1996

6.9

2015

7.3

2007

6.6

2006

7.4

1976

7.8

2021

8.0

1970

5.0

1985

5.4

1962

5.9