74% (2007)

60% (2008)

49% (1997)

59% (2002)

64% (1992)

46% (1982)

0% (1976)

0% (1998)

61% (2005)

52% (2005)

0% (2002)

70% (1996)

0% (2006)

0% (1975)

78% (1994)

0% (2009)

40% (2005)

0% (2003)

0% (1984)

42% (2009)