54% (2002)

52% (2005)

54% (2007)

67% (2011)

70% (1998)

46% (2006)

61% (2004)

61% (2005)

48% (2007)

49% (2004)

49% (2001)

75% (2005)

62% (2005)

67% (2004)

67% (2003)

64% (2006)

47% (1997)

62% (2000)

69% (2003)

55% (2005)