2000

6.4

1992

5.3

1989

6.4

1992

6.7

1998

6.3

1992

5.7

1994

5.8

1988

6.8

1989

8.3

1994

8.3

1979

5.0

2001

8.6

1990

7.3

1989

7.2

1991

5.7

1998

6.8

1990

6.5

1987

0.0

1989

0.0