2008

7.3

1990

6.0

1990

5.6

1991

6.1

1997

6.2

2005

6.2

1981

6.2

1933

5.5

2002

6.8

2001

6.5

1987

6.5

1959

7.0

2003

6.5

1987

6.3

1999

6.1

2003

6.1

1993

5.6

1996

6.0

2002

6.7

1981

6.5