54% (2009)

60% (2015)

54% (2013)

61% (1997)

46% (2000)

60% (2007)

48% (2002)

47% (2009)

59% (2003)

58% (1996)

53% (2005)

55% (2011)

39% (2006)

59% (2015)

67% (1998)

65% (2003)

58% (2002)

65% (2004)

46% (2012)

53% (2010)