72% (1981)

52% (1978)

65% (1984)

78% (1976)

65% (1979)

47% (1984)

66% (1976)

39% (1977)

48% (1995)

56% (1979)

70% (1977)

46% (1978)

38% (1978)

63% (1980)

48% (1977)

50% (1981)

50% (1979)

60% (1975)

40% (1978)

42% (1977)