1965

6.7

2003

8.3

1985

6.2

1953

7.3

1973

7.4

2001

6.0

2007

7.8

2007

6.3

2007

6.2

1939

7.5

2004

5.6

2005

7.2

1963

6.9

1996

7.0

2004

6.7

1991

7.4

1974

6.4

1932

6.0

2000

6.2

1981

6.2