1961

6.5

1946

7.3

2007

6.8

2005

6.4

1983

6.0

1953

7.0

1954

7.1

2005

7.0

2008

5.3

1931

5.0

1999

7.0

1999

6.5

1968

7.0

1997

6.7

1957

7.2

1964

7.4

2003

7.5

2007

5.8

2008

5.8

1992

6.7