2000

7.7

1998

8.2

2004

7.9

1981

5.6

1990

5.3

2005

8.1

2002

6.7

1986

7.0

1985

7.7

2001

7.6

1987

8.4

2004

0.0

2005

7.2

1988

6.3

1999

8.3

1987

5.2

1991

4.5