2000

4.8

1985

6.7

1990

2.3

1995

8.0

1990

7.4

1994

7.2

1989

6.9

2005

8.3

2003

0.0

1991

7.4

2001

6.8

1999

7.5

1992

6.2

2009

7.9

1984

7.5

1996

5.4

1989

6.5

1989

8.3

1993

7.9

1993

6.7

1991

7.0

2001

0.0

1998

6.8

1990

6.9