1991

6.8

2010

0.0

1948

6.1

1893

5.6

2013

0.0

2010

7.3

2011

0.0

1984

6.9

2002

2.9

2009

7.0

2010

4.0

2012

6.0

2007

0.0

1918

6.0

2013

4.4

2014

4.3

2001

7.1

2006

7.5

2003

7.2

1933

6.9