67% (2010)

59% (2010)

61% (2005)

54% (2005)

51% (2010)

52% (2008)

72% (2003)

60% (2009)

54% (1990)

63% (2004)

67% (1990)

46% (1995)

70% (1996)

56% (2004)

47% (1995)

58% (1996)

56% (1997)

50% (2003)

63% (1996)

52% (2009)