72% (1981)

65% (1984)

78% (1976)

77% (1974)

47% (1984)

39% (1977)

71% (1977)

48% (1995)

66% (1976)

65% (1979)

58% (1976)

44% (1986)

51% (1976)

54% (1985)

52% (1978)

50% (1979)

46% (1978)

60% (1975)

63% (1980)

47% (1976)