55% (1995)

53% (1999)

48% (2004)

46% (2003)

66% (1997)

72% (2003)

70% (1995)

64% (2006)

44% (2002)

54% (1998)

50% (2005)

54% (1993)

69% (1988)

59% (2002)

62% (2000)

47% (2004)

63% (1997)

68% (1997)

53% (1993)

61% (2004)