50% (1984)

71% (2002)

60% (1986)

66% (2000)

50% (1997)

58% (2004)

78% (1993)

54% (1991)

60% (1995)

48% (1985)

35% (1999)

67% (1994)

50% (1990)

69% (1989)

0% (1996)

65% (1991)

57% (1987)

63% (1989)

59% (1990)

55% (1994)