46% (2004)

53% (2002)

60% (2000)

55% (1998)

55% (2002)

55% (2000)

69% (2001)

62% (1999)

75% (1993)

55% (2004)

69% (1988)

65% (1996)

63% (1990)

50% (2006)

67% (1997)

56% (1995)

46% (2003)

68% (1997)

42% (2000)

70% (1995)