63% (1988)

45% (1990)

62% (1994)

57% (1993)

67% (1990)

47% (1995)

49% (1993)

52% (1995)

45% (1994)

47% (1995)

43% (1995)

41% (1994)

54% (1995)

49% (1994)

41% (1978)

45% (1993)

48% (1994)

48% (1995)

80% (1996)

33% (1996)