Year	Percent
2000-01-01	68.5493587094797
2001-01-01	69.7385273682356
2002-01-01	72.1880247484643
2003-01-01	70.8153787637467
2004-01-01	71.8321281285127
2005-01-01	72.2611208856033
2006-01-01	72.6828368578062
2007-01-01	74.7638501113337
2008-01-01	74.3042106760778
2009-01-01	74.3374570234991
2010-01-01	75.0119361143210
2011-01-01	76.5424517617836
2012-01-01	77.1756837223699
2013-01-01	78.1769618522986
2014-01-01	79.6654077170319
2015-01-01	79.0792394646653
2016-01-01	79.0851739467344
2017-01-01	80.4180920600041