1971

3.7

1977

5.7

1963

7.7

1985

5.3

1986

4.3

1972

6.0

1958

0.0

1972

6.2

1987

4.6

1967

7.4

1970

5.5

1984

5.3

1972

6.7

1969

7.0

1960

7.6

1988

6.9