71% (1991)

60% (2004)

65% (2003)

54% (2004)

72% (1992)

73% (1993)

74% (1996)

65% (1994)

55% (1998)

73% (2004)

60% (1991)

57% (1994)

61% (2001)

54% (1996)

62% (2000)

51% (2004)

63% (1995)

66% (2000)

67% (1996)

70% (1996)