55% (2009)

45% (2013)

51% (2011)

47% (2002)

54% (2006)

53% (1997)

51% (2003)

60% (1996)

60% (2009)

53% (2008)

57% (2008)

51% (2000)

46% (2008)

65% (2007)

46% (1995)

58% (1996)

37% (1997)

36% (2001)

53% (1999)

49% (2002)