2006

5.7

2008

5.1

1971

4.5

2012

7.0

2013

7.4

2009

6.0

1970

5.5

1968

7.4

1978

6.8

2002

6.9

1892

4.7

1892

3.7

1983

7.6

1919

0.0

2014

7.4

1970

6.2

2008

6.5

2013

7.5

2014

6.5

2012

5.7