1970

5.5

1989

8.2

1985

4.0

1996

6.9

1971

6.2

1997

7.6

1978

5.4

1965

7.8

1971

0.0

1983

6.3

1979

6.7

1982

6.3

1991

5.4

1972

8.0

1987

7.4

1998

0.0