73% (1993)

65% (2000)

54% (2001)

72% (1992)

54% (2004)

71% (1991)

60% (2001)

62% (1997)

60% (2004)

65% (2003)

65% (1994)

66% (1995)

58% (1996)

62% (2000)

73% (2004)

55% (1998)

58% (1994)

74% (1996)

54% (1996)

60% (1991)