2006

8.0

2003

0.0

2008

0.0

2005

6.5

2007

5.8

2001

7.1

2008

1.0

2000

3.8

2004

6.9

2006

6.1

1998

7.3

1987

7.8

1974

6.8

2005

5.8

2003

6.6

1981

6.5

1980

6.4

2007

6.7

2006

5.9

2001

4.9