Year	Percent
2000-01-01	60.02439
2001-01-01	61.63681
2002-01-01	61.88870
2003-01-01	61.42829
2004-01-01	62.56858
2005-01-01	62.27152
2006-01-01	64.09389
2007-01-01	64.58571
2008-01-01	66.42405
2009-01-01	67.72123
2010-01-01	62.07767