45% (2004)

60% (2000)

55% (1998)

72% (1994)

64% (1998)

75% (1999)

75% (1993)

67% (1997)

62% (1990)

65% (1996)

49% (2001)

68% (1991)

70% (2004)

69% (2001)

72% (2003)

60% (2006)

55% (1995)

66% (1997)

72% (2003)

64% (2006)