1965

7.7

1976

7.8

2008

6.9

2011

8.0

1987

6.5

2008

6.6

1962

7.6

2007

7.3

1966

7.2

1976

5.6

1984

5.0

2005

7.1

2008

6.9

1973

4.5

1974

9.0

2016

6.8

1945

6.0

1955

6.8

2008

7.1

1986

7.4