44% (1993)

45% (2005)

55% (1996)

52% (2006)

35% (1995)

35% (1998)

22% (1990)

37% (1991)

53% (2009)

10% (2010)

55% (2009)

49% (2005)

10% (2012)

25% (1987)

20% (2002)

28% (1979)

38% (2003)