1974

10.0

2006

5.8

2001

6.4

2017

6.1

2012

7.2

2012

6.4

2003

7.8

2008

7.3

2008

8.5

2015

6.9

2010

7.8

2006

7.9

2002

8.0

2004

7.3

1981

7.9

2006

6.6

2012

8.2

1997

4.4

2005

7.7

1994

8.7