72% (2011)

76% (2013)

61% (2007)

65% (2011)

60% (2008)

64% (2007)

67% (2006)

62% (1997)

60% (2012)

64% (2003)

67% (2003)

52% (2007)

60% (1999)

52% (2005)

47% (1998)

58% (2001)

50% (2018)