1969

0.0

1974

7.2

1988

6.2

1972

5.5

1967

4.0

1977

5.9

1969

6.0

1968

5.7

1966

7.6

1963

5.8

1981

5.0

1976

6.5

1981

2.2

1969

5.9

1972

7.8

1970

7.5