2011

8.0

2017

8.0

2007

5.9

2001

5.6

2008

6.4

2004

4.2

2004

6.1

1985

6.7

2004

7.4

1981

5.5

2002

7.6

2005

4.0

1989

7.7

2003

0.0

2004

7.5

1975

7.3

0.0

2006

0.0

1985

4.3

2005

5.2