1958

7.5

1956

6.4

2006

8.0

2004

6.3

2007

6.2

1999

6.8

1962

8.2

1967

6.5

1973

6.0

2008

6.9

1974

6.7

1981

6.5

2006

5.9

1980

6.4

2007

6.7

2005

6.8

2004

6.4

2004

6.5

1932

6.9

1953

7.3