67% (2002)

57% (2004)

49% (2006)

66% (1990)

62% (2005)

60% (2001)

67% (1996)

66% (1985)

42% (2004)

50% (1989)

46% (1981)

34% (1998)

64% (2004)

65% (1999)

52% (2008)

0% (1998)

0% (1987)

0% (1977)