1997

4.5

1959

6.9

1940

7.1

1996

7.3

1985

6.4

2003

5.7

1953

7.2

2004

6.0

2000

6.3

2003

6.6

2003

7.1

2001

5.9

2004

7.5

1993

7.8

1964

7.0

2005

6.5

2005

6.4

2002

6.0

1984

5.3

2004

6.2