1993

1.0

1990

6.7

1994

4.7

1998

2.7

1992

7.1

1996

5.9

1995

0.0

2004

7.4

1987

5.6

1994

8.3

1989

5.0

2007

8.1

2001

5.8

1990

6.0

1989

6.0

2003

0.0

2003

7.7