72% (1981)

65% (1979)

65% (1984)

67% (1977)

39% (1977)

58% (1976)

78% (1976)

47% (1984)

49% (1995)

66% (1976)

68% (1980)

51% (1976)

44% (1986)

52% (1978)

51% (1983)

50% (1981)

50% (1979)

77% (1974)

56% (1979)

59% (1978)