1975

5.9

1995

0.8

1981

1.0

1994

4.6

1989

4.1

1978

4.3

1983

6.3

1982

4.5

1979

5.8

1996

7.7

1998

5.3

1995

3.0

1980

4.6

1995

7.7

1985

7.8

1981

6.6

1996

5.9