1946

7.5

1967

7.3

1954

7.9

1962

7.9

2001

6.9

1995

7.7

2004

6.3

1979

7.7

1923

7.5

1977

7.7

1994

6.8

1993

7.4

2000

7.0

1953

7.3

1939

7.9

1999

3.2

2014

6.2

2011

6.0

2009

5.2