Year	Percent
2000-01-01	59.5943534071968
2001-01-01	59.7563418932101
2002-01-01	60.5907663737694
2003-01-01	58.9859515242388
2004-01-01	60.1704711881552
2005-01-01	59.7854548291764
2006-01-01	59.7606465729259
2007-01-01	60.9015937083457
2008-01-01	61.3438699016819
2009-01-01	61.2240708318584
2010-01-01	62.4471177457530
2011-01-01	63.8679893246059
2012-01-01	64.6928071727327
2013-01-01	65.7525921970042
2014-01-01	67.4340856764954
2015-01-01	67.8845905858633
2016-01-01	68.0438233133942
2017-01-01	69.1361338960014