0% (2006)

30% (2004)

24% (1997)

23% (2005)

35% (1991)

72% (2006)

30% (1997)

23% (2005)

35% (1985)

37% (1993)

37% (1992)

55% (1993)

51% (2004)

40% (2002)

35% (1997)

10% (2007)

50% (1994)

0% (2005)