1975

10.0

1972

7.4

1992

6.6

1989

7.2

1996

6.8

2006

6.9

2002

7.1

1948

7.9

1953

7.7

1992

7.5

1929

7.5

1958

7.7

1984

8.0

1998

7.3

1957

8.5

1966

7.7

1961

7.2

2005

6.8

1935

5.8

1970

6.0