1979

6.3

1989

4.6

1976

7.5

1989

1.0

1996

6.2

1991

5.3

1999

6.2

1984

0.0

2003

0.0

1988

6.5

1999

0.0

1985

4.7

1986

0.0

1997

3.5

1990

6.0

1988

6.0

1998

5.2

1997

0.0