1983

6.3

1995

6.5

2005

6.2

1992

6.3

2003

7.0

1988

4.9

1932

7.4

1967

7.7

1946

7.6

1968

7.2

1941

7.7

1995

6.6

1951

7.7

1988

7.5

2013

5.6

1967

4.7

1961

7.3

1963

7.0

1964

7.0

2017

5.2