69% (2006)

48% (1992)

45% (1993)

50% (2003)

38% (1995)

33% (1989)

51% (1995)

35% (1987)

39% (1987)

56% (1988)

47% (2002)

38% (1990)

37% (2006)

46% (2006)

47% (2007)

39% (2008)

35% (2005)

49% (1995)

30% (2008)

78% (2007)