Year	Percent
2000-01-01	48.7913119171895
2001-01-01	48.3207204881051
2002-01-01	48.0633865790249
2003-01-01	46.0154254675960
2004-01-01	47.1225237669795
2005-01-01	46.5303612279538
2006-01-01	47.0644273707450
2007-01-01	47.5112712863672
2008-01-01	47.7886273701177
2009-01-01	47.4217052004908
2010-01-01	48.1127713430927
2011-01-01	48.9823901537894
2012-01-01	50.2886310021875
2013-01-01	51.4678283663021
2014-01-01	53.1432731861010
2015-01-01	54.3043052795498
2016-01-01	54.7368906900048
2017-01-01	55.8608824576434