1975

6.0

1995

0.8

1981

0.0

1994

5.5

1989

4.6

1978

4.6

1983

6.6

1982

5.1

1979

5.8

1996

7.7

1998

5.0

1995

3.5

1980

4.6

1995

7.7

1985

7.7

1981

7.2

1996

5.8