Year	Percent
1995-01-01	58.3081694562909
1996-01-01	58.2819367597673
1997-01-01	59.7072729930970
1998-01-01	58.8883288398656
1999-01-01	60.3860253668401
2000-01-01	60.6917838919208
2001-01-01	60.9156934074420
2002-01-01	63.1700101831201
2003-01-01	65.3784462300868
2004-01-01	65.9273259878138
2005-01-01	66.6769294332325
2006-01-01	66.1709234110044
2007-01-01	66.9807209661666
2008-01-01	66.8225532165764
2009-01-01	67.2623276819377
2010-01-01	67.9648144568280
2011-01-01	68.0879558709290
2012-01-01	68.5316270174528
2013-01-01	69.4022811497175
2014-01-01	69.6626893471690
2015-01-01	70.7194519322448
2016-01-01	71.4066623165002
2017-01-01	71.0458657213423