68% (1992)

47% (1989)

75% (1989)

65% (1997)

53% (1987)

42% (1996)

63% (1997)

48% (1991)

50% (1998)

45% (1993)

64% (1994)

67% (1997)

65% (1989)

54% (1988)

63% (1997)

65% (1985)

65% (1996)

63% (1993)

63% (1998)

62% (1989)