1970

5.5

1989

8.1

1985

4.1

1996

7.2

1971

6.2

1997

7.6

1978

5.1

1965

7.8

1971

0.0

1983

6.3

1979

6.7

1982

6.4

1991

5.9

1972

8.0

1987

7.5

1998

0.0