2002

7.1

1997

6.9

1974

7.5

1987

8.1

2004

7.9

1940

7.2

1963

7.7

1993

6.3

1993

7.4

2006

6.3

1999

7.8

1959

7.5

1962

7.6

2005

6.6

1988

7.5

1970

7.5

2007

7.9

1998

7.2

1939

5.0

2002

6.4