35% (1997)

30% (1997)

24% (1997)

23% (2005)

55% (1993)

51% (2004)

30% (2004)

35% (1991)

37% (1992)

40% (2002)

37% (1993)

72% (2006)

0% (2006)

35% (1985)

10% (2007)

23% (2005)

0% (2005)

50% (1994)