72% (1981)

65% (1984)

39% (1977)

67% (1977)

47% (1984)

65% (1979)

49% (1995)

66% (1976)

78% (1976)

68% (1980)

58% (1976)

38% (1978)

52% (1978)

77% (1974)

60% (1975)

44% (1986)

51% (1976)

51% (1983)

50% (1979)

59% (1978)