63% (1997)

60% (2001)

59% (1999)

70% (2003)

57% (2001)

59% (2000)

68% (2006)

57% (1999)

67% (2005)

61% (1999)

63% (1997)

50% (2000)

58% (1998)

66% (1999)

0% (1970)

67% (2012)