72% (1981)

65% (1984)

47% (1984)

39% (1977)

49% (1995)

79% (1976)

67% (1977)

77% (1974)

65% (1979)

66% (1976)

50% (1979)

51% (1976)

60% (1975)

50% (1981)

52% (1978)

59% (1978)

51% (1983)

40% (1978)

56% (1979)

58% (1976)