63% (1988)

62% (1994)

67% (1990)

57% (1993)

47% (1990)

52% (1995)

49% (1993)

47% (1995)

47% (1995)

48% (1995)

48% (1994)

41% (1978)

80% (1996)

54% (1995)

48% (1994)

25% (1992)

65% (1991)

45% (1994)

53% (1997)

33% (1996)