1946

7.5

1997

7.4

1995

7.7

1986

7.1

1997

7.0

1927

8.1

2004

8.1

1987

7.3

1976

8.1

2000

7.3

1987

7.8

1928

8.0

2005

6.7

1966

8.2

1953

7.9

1999

6.3

1991

7.6

2001

7.6

1977

7.3

1999

7.2