1984

6.9

1992

7.3

1974

4.0

1988

3.9

1983

4.7

1986

4.6

1984

7.2

1982

7.5

1979

6.7

1983

7.0

1994

5.7

1996

3.9

1998

5.7

1977

6.3

1985

6.8

1987

4.9

1984

0.0