Year	Percent
1999-01-01	35.9905
2000-01-01	43.4348
2001-01-01	43.0175
2002-01-01	52.7926
2003-01-01	55.0590
2004-01-01	56.5634
2005-01-01	55.9503
2006-01-01	65.0413
2007-01-01	65.4891
2008-01-01	57.9854
2009-01-01	71.7659
2010-01-01	65.3874
2011-01-01	51.6736
2012-01-01	60.0266
2013-01-01	63.4607
2014-01-01	63.7374
2015-01-01	67.8506
2016-01-01	59.7760