28% (2003)

32% (1998)

38% (1997)

43% (1993)

53% (2009)

28% (1999)

60% (2008)

22% (1990)

34% (1998)

28% (1988)

49% (2005)

38% (2003)

37% (1991)

28% (1979)

25% (1987)

10% (2012)

10% (2010)