50% (1984)

71% (2002)

66% (2000)

50% (1997)

58% (2004)

78% (1993)

67% (1994)

50% (1990)

60% (1986)

69% (1989)

59% (1990)

65% (1991)

60% (1995)

50% (1990)

63% (1989)

35% (1999)

55% (1994)

65% (1991)

73% (1996)

50% (1993)