2006

10.0

2007

8.0

2009

8.7

2016

8.6

2000

7.5

1972

6.9

2011

7.1

2012

7.4

2009

7.5

1989

8.3

2017

6.0

2006

9.3

2006

7.3

1995

8.1

2001

7.6

2009

6.8

2005

8.2

2007

7.5

2014

6.4

1993

5.6