2018

4.9

2012

7.0

2013

5.8

2017

6.9

2006

6.4

1999

8.4

1998

6.0

2015

7.8

1995

7.6

1984

7.3

2007

7.2

2007

6.2

2003

7.8

2005

6.6

2009

6.3

2008

6.2

2011

5.2

2008

7.0

2014

6.9

1994

8.7