Year	Percent
2000-01-01	66.8666536240064
2001-01-01	66.4425992353133
2002-01-01	65.5697492211704
2003-01-01	65.7050028852230
2004-01-01	65.0162130964368
2005-01-01	66.9132817550807
2006-01-01	69.5781388183400
2007-01-01	71.0179181675441
2008-01-01	73.2201823742640
2009-01-01	74.4101204815714
2010-01-01	74.4186153682533
2011-01-01	74.9463492869026
2012-01-01	73.6625069393040
2013-01-01	73.6011218387369
2014-01-01	71.5493799000633
2015-01-01	70.1291647774979
2016-01-01	69.8451143130294
2017-01-01	69.7145272206212