45% (2004)

53% (2002)

49% (2001)

60% (2000)

55% (1998)

55% (2004)

56% (2000)

55% (2002)

75% (1993)

62% (1999)

65% (1996)

50% (2006)

48% (2004)

70% (1995)

62% (1990)

48% (2004)

55% (1995)

46% (2003)

66% (1997)

75% (1999)