72% (1985)

57% (1984)

52% (1979)

40% (1989)

67% (1989)

66% (1979)

62% (1985)

38% (1985)

49% (1989)

60% (1971)

45% (1976)

47% (1978)

42% (1988)

46% (1971)

32% (1989)

46% (1976)

50% (1986)

56% (1988)

0% (1992)

57% (1973)