55% (1996)

58% (2003)

54% (2008)

65% (1997)

70% (2002)

55% (2010)

64% (2001)

52% (2004)

65% (1997)

61% (1998)

40% (2005)

57% (2008)

43% (2009)

62% (1997)

59% (1998)

57% (2005)

55% (1996)

50% (1997)

47% (1994)

48% (1995)