78% (1987)

61% (1986)

55% (1981)

71% (1964)

59% (1971)

48% (1975)

60% (1983)

47% (1975)

45% (1976)

61% (1979)

53% (1985)

52% (1982)

56% (1973)

64% (1976)

0% (1979)

76% (1963)

61% (1965)

55% (1973)

43% (1978)

50% (1996)