15% (2001)

44% (2007)

48% (2001)

51% (2004)

70% (1997)

60% (2003)

35% (2004)

46% (2003)

44% (2003)

49% (2004)

38% (2002)

46% (2009)

49% (2001)

31% (1998)

35% (2004)

42% (2002)

43% (2003)

32% (2006)

29% (1998)

35% (2005)