71% (1981)

65% (1984)

78% (1976)

47% (1984)

65% (1979)

39% (1977)

71% (1977)

66% (1976)

51% (1976)

56% (1979)

52% (1978)

77% (1974)

42% (1977)

51% (1983)

38% (1978)

48% (1995)

54% (1987)

63% (1980)

55% (1978)

48% (1977)