69% (1990)

62% (1991)

60% (1993)

56% (1978)

68% (1994)

20% (1996)

70% (1992)

50% (1979)

69% (1991)

58% (1993)

47% (1991)

57% (1994)

51% (1980)

45% (1990)

72% (1993)

47% (1993)

43% (1994)

44% (1992)

58% (1993)

52% (1993)