69% (2003)

54% (2004)

50% (2002)

35% (2011)

66% (1993)

65% (1997)

58% (2004)

55% (2007)

35% (2010)

68% (1994)

0% (1998)

0% (1994)

0% (1986)

0% (1981)

0% (1995)

0% (1984)

0% (2005)