2010

4.9

2006

6.8

2008

6.6

2008

6.3

2011

7.2

2009

7.4

2015

6.8

2007

7.0

2001

6.4

1982

7.5

2003

5.6

1938

7.1

1999

7.6

2011

6.5

2006

7.3

2008

7.3

2009

6.6

2009

7.3

2011

6.8

2012

6.3