57% (2001)

65% (1996)

62% (2003)

50% (2009)

59% (2000)

61% (2011)

71% (2012)

67% (2005)

69% (2003)

64% (1997)

57% (1999)

66% (1999)

58% (1998)

50% (2000)

0% (1970)