1964

7.6

1959

5.2

1971

7.5

1992

7.7

1940

7.4

1944

7.0

2014

5.9

1998

7.9

1953

7.2

2007

5.9

2006

6.5

1980

5.5

1941

7.0

1950

7.0

1996

6.3

2000

6.2

1976

6.6

1994

8.3

2009

7.2

1939

7.6