68% (1998)

64% (2009)

74% (2007)

61% (2000)

60% (2012)

59% (2014)

56% (2016)

59% (2016)

46% (2001)

66% (2008)

61% (2009)

55% (2002)

57% (2006)

40% (2005)

61% (2009)

62% (2000)

53% (2009)

26% (2001)

52% (2007)

58% (2009)