1993

0.0

1990

7.0

1994

4.8

1998

3.5

1992

7.1

1996

6.0

2004

7.4

1987

5.6

1994

8.3

1989

5.0

2007

8.1

2001

5.9

1990

6.0

1989

6.0

2003

0.0

2003

7.7