2005

5.4

2004

7.3

2003

5.8

1998

6.8

1997

6.5

1996

7.1

1916

6.7

2006

5.7

2011

0.0

1998

0.0

2013

7.5

2006

4.0

2008

6.5

1933

6.6

2007

3.2

2011

7.2

1980

6.3

1935

4.5

1979

6.2

1981

7.3