2003

5.2

1992

4.7

1991

6.5

1981

6.0

1933

6.6

2004

7.2

2009

3.5

2005

6.5

2002

6.1

2009

5.8

1955

2.4

2009

6.5

1959

5.4

1920

7.9

1999

5.7

2006

10.0

1908

4.8

2006

4.7

2004

3.0

2008

6.5