2004

7.4

2007

7.7

2001

8.1

1990

7.9

2014

7.6

1994

6.8

2006

7.5

2016

7.3

2006

7.7

2001

8.4

2008

6.1

2011

7.7

2010

6.4

2014

7.4

2015

6.3

2009

7.4

2008

7.6

2001

7.3

2015

6.1

2013

6.9