2009

6.6

2007

6.9

1985

7.2

2011

6.7

2009

7.4

2008

6.8

2005

6.8

2011

6.9

2006

7.6

2013

7.0

2000

9.4

2006

6.9

2003

6.9

2013

6.9

2006

6.4

2015

6.2

1989

5.2

2010

6.3

1937

6.7

1941

7.0