50% (1960)

40% (1963)

58% (1967)

61% (1969)

40% (1958)

0% (1970)

20% (1980)

20% (1978)

40% (1959)

0% (1958)

30% (1976)

33% (1975)

0% (1982)

50% (1962)

0% (1980)

0% (1978)

70% (1961)

43% (1970)

0% (1979)

65% (1960)