1996

7.3

1953

7.8

2004

6.5

2005

7.1

1932

7.4

1930

6.1

1946

6.9

2002

7.2

1971

7.2

1963

7.7

2007

7.3

2004

7.0

1982

6.9

1985

7.1

1975

7.9

2007

4.5

2005

6.0

2002

6.3

2001

7.1

1998

6.8