57% (1975)

64% (1980)

58% (1988)

60% (1968)

0% (1963)

0% (1961)

0% (1977)

61% (1971)

30% (1990)

50% (1976)

70% (1967)

66% (1976)

40% (1973)

69% (1968)

69% (1986)

50% (1965)

0% (1984)

78% (1974)

0% (1972)

45% (1971)