Year	Percent
2000-01-01	74.4448550172691
2001-01-01	74.3998974980851
2002-01-01	75.0744893980044
2003-01-01	74.8681828568801
2004-01-01	75.2189062617078
2005-01-01	74.8463299170508
2006-01-01	74.4788866358576
2007-01-01	74.4138483633330
2008-01-01	73.7777345686417
2009-01-01	73.2142571057124
2010-01-01	73.1864717935440
2011-01-01	73.3605014449323
2012-01-01	73.5445287241726
2013-01-01	73.5462265957800
2014-01-01	74.3582661706939
2015-01-01	74.1120247681402
2016-01-01	73.9946350328945
2017-01-01	74.0512302189034