1957

6.2

1984

7.2

2012

6.8

1932

6.9

1951

7.5

1922

7.7

1987

4.5

1995

6.8

1972

7.0

1987

6.5

2019

7.6

1939

7.9

1990

6.1

2010

6.9

2011

7.1

1966

7.3

1963

7.3

2007

4.9

2010

5.7

1998

7.3