1988

5.5

1990

7.5

1988

6.3

1991

4.4

1981

7.5

1994

7.8

1988

6.4

1984

0.0

1999

6.8

1987

0.0

1985

5.7

2005

6.2

1997

4.6

2001

7.6

2004

6.7

1999

8.2

1993

8.4

2002

6.5