59% (1993)

76% (1997)

74% (2002)

62% (2002)

77% (1996)

74% (1999)

67% (1992)

66% (1993)

40% (1996)

30% (1992)

60% (1997)

64% (1998)

62% (1991)

70% (1990)

60% (2000)

58% (1995)

55% (1992)

67% (1993)

70% (1998)

55% (1995)