Year	Percent
1999-01-01	50.2388
2000-01-01	48.5058
2001-01-01	32.6927
2002-01-01	21.3359
2003-01-01	27.1021
2004-01-01	32.5131
2005-01-01	36.3147
2006-01-01	49.7835
2007-01-01	41.8305
2008-01-01	16.8976
2009-01-01	32.5939
2010-01-01	41.4898
2011-01-01	30.2852
2012-01-01	41.0317
2013-01-01	48.0948
2014-01-01	45.8122
2015-01-01	53.0025
2016-01-01	49.3923