1992

10.0

2007

6.7

2004

6.6

2001

6.4

2008

6.5

1996

7.0

2016

5.9

2017

7.0

2001

7.5

2016

5.9

2012

5.7

2003

6.2

2013

7.2

2018

7.6

2012

4.5

2004

7.8

2010

6.2

2012

6.9

2002

7.5

1996

6.7