55% (1987)

68% (1971)

60% (1978)

65% (1971)

57% (1975)

42% (1976)

52% (1978)

58% (1969)

62% (1970)

66% (1977)

48% (1977)

52% (1979)

61% (1970)

47% (1978)

54% (1988)

50% (1971)

55% (1988)

63% (1964)

56% (1971)

75% (1971)