0.0

1986

8.3

2006

0.0

2007

7.8

2008

2.5

1999

6.8

2007

7.7

2011

0.0

1982

6.9

1996

6.5

1998

7.0

2006

8.2

2007

2.5

2007

0.0

2000

8.2

1984

4.5

2002

8.5

2005

7.2

2006

7.4

1994

9.2