53% (2004)

49% (2005)

46% (1996)

57% (2009)

49% (2005)

49% (1998)

48% (1995)

53% (2001)

49% (1993)

54% (1998)

45% (1994)

50% (2000)

55% (2000)

35% (1996)

56% (2005)

0% (1970)