1996

6.4

1998

8.2

2001

7.2

1999

6.6

1994

7.8

2000

7.0

1993

7.7

2003

5.6

1995

7.3

1999

7.2

2001

5.9

1991

5.2

1992

7.3

2001

7.1

1990

1.0

1991

5.6