51% (2010)

61% (2005)

48% (1995)

61% (2009)

62% (2004)

66% (2010)

60% (2010)

70% (1996)

54% (1990)

45% (1992)

63% (2002)

58% (1996)

53% (2008)

56% (2004)

53% (2005)

65% (1996)

50% (1990)

62% (2003)

58% (2008)

43% (2005)