23% (2001)

36% (2000)

58% (1999)

43% (2002)

50% (2004)

56% (2006)

58% (2011)

55% (2005)

35% (2003)

50% (2001)

50% (2003)

48% (1999)

58% (2002)

46% (1997)

51% (2008)

51% (2000)

44% (2002)

52% (2003)

35% (1998)

56% (2012)