1999

0.0

1987

5.8

1993

6.8

1998

3.8

1990

5.2

1995

4.7

1992

5.2

2002

6.1

1992

6.8

1988

6.2

1989

5.3

1998

5.2

2004

6.6

2000

3.8

1983

6.2

1993

6.2

1994

6.8

1994

7.2

1997

6.1

1996

5.8