2006

7.5

2015

7.6

2000

7.2

2017

7.0

2003

5.7

2001

6.0

2007

5.2

2007

6.0

2016

6.6

2014

6.3

2009

5.7

2010

7.0

1988

5.8

2012

6.1

1968

7.2

1996

6.9

2005

6.9

1988

7.3

2016

7.0

2015

6.6