72% (1981)

65% (1984)

65% (1979)

78% (1976)

66% (1976)

48% (1995)

52% (1978)

47% (1976)

46% (1984)

70% (1977)

51% (1976)

38% (1977)

51% (1983)

64% (1980)

46% (1978)

54% (1987)

48% (1977)

77% (1974)

56% (1979)

40% (1978)