55% (1993)

61% (1994)

49% (1995)

56% (1997)

50% (2000)

51% (2007)

67% (2007)

47% (1989)

56% (1992)

47% (1996)

37% (1995)

51% (1993)

57% (2004)

64% (2008)

57% (1996)

58% (1996)

65% (2001)

63% (2005)

61% (2006)

55% (1995)