2001

7.9

1999

8.5

1975

8.4

1995

8.0

1997

7.4

1986

7.5

1953

8.0

1955

7.6

1983

7.2

1930

7.3

1986

7.9

1972

8.7

1974

8.6

2002

6.7

2005

6.7

1954

10.0

1966

7.2

1999

6.8

1962

7.3

1968

7.8