58% (2008)

51% (2004)

49% (2005)

39% (2002)

56% (1996)

56% (1998)

44% (2004)

62% (2006)

40% (2004)

48% (2003)

56% (2009)

54% (2004)

55% (2007)

59% (2005)

56% (2000)

41% (1999)

38% (1997)

55% (2008)

64% (1997)

38% (2004)