2004

6.6

2010

7.0

2014

6.8

2015

5.3

2003

6.9

1998

5.1

2004

7.4

2001

6.0

1933

7.3

2010

5.9

2014

7.0

2005

5.5

2011

6.1

1968

6.6

2014

6.9

2007

4.9

2011

6.6

2009

5.7

2017

6.4

2015

6.0