20% (2002)

28% (1979)

55% (1996)

45% (2005)

22% (1990)

34% (1998)

53% (2009)

49% (2005)

55% (2009)

52% (2006)

10% (2010)

55% (2009)

37% (1995)

10% (2012)

28% (1991)

25% (1987)

38% (2003)