45% (1983)

49% (2000)

52% (2009)

55% (2008)

51% (2002)

62% (2002)

45% (2007)

44% (2009)

41% (2005)

48% (2007)

53% (1997)

51% (2000)

62% (2005)

52% (2013)

49% (1998)

54% (2007)

39% (2008)

45% (2006)

45% (2003)

48% (2009)