71% (1991)

73% (1992)

60% (2004)

59% (1991)

65% (2003)

74% (1996)

73% (1993)

72% (2004)

53% (2004)

63% (1994)

65% (1994)

72% (1994)

67% (1992)

76% (1994)

60% (2001)

55% (1998)

67% (1996)

57% (1994)

69% (1996)

63% (2000)