36% (2011)

43% (2003)

42% (2008)

44% (2004)

43% (2001)

45% (2000)

37% (1996)

42% (2010)

58% (1995)

51% (2007)

49% (2006)

35% (2010)

49% (2003)

46% (1999)

54% (2001)

49% (2001)

45% (1996)

47% (2010)

33% (2006)

56% (2005)