2000

7.2

1995

6.8

2004

6.4

1947

7.4

1992

7.3

1970

6.3

2002

7.5

1991

8.3

2006

5.5

2001

6.4

1966

8.0

1940

7.8

1954

7.2

2004

5.8

1995

6.2

1952

7.7

2008

7.0

1994

7.9

1928

7.8

1966

7.2