1985

7.5

2005

8.3

2004

7.9

2008

6.8

1994

7.8

1993

7.7

2003

3.2

2008

7.1

2007

8.1

2002

8.0

1986

5.9

1986

6.7

1993

7.9

2001

7.6

1982

6.4

1985

6.5

1999

8.3

2002

7.2