52% (2007)

57% (1995)

45% (2004)

46% (1999)

44% (2008)

49% (2006)

39% (1996)

33% (2006)

40% (2003)

44% (2001)

55% (2001)

51% (2003)

43% (2010)

36% (2011)

49% (2010)

56% (2005)

32% (1998)

44% (1996)

54% (2001)

36% (2010)