45% (2004)

53% (2002)

60% (2000)

49% (2001)

56% (2000)

63% (1999)

55% (1998)

55% (2002)

62% (1990)

75% (1993)

55% (1995)

65% (1996)

68% (1997)

53% (1999)

72% (2003)

50% (2006)

55% (2004)

68% (1988)

48% (2004)

67% (1997)