1992

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

6.4

1998

7.0

2006

8.1

2007

4.0

2007

0.0

2000

8.2

1984

4.5

2002

8.5

2005

7.2

1994

9.2

1989

8.0