Year	Percent
1996-01-01	51.3177
1997-01-01	48.0199
1998-01-01	44.7646
1999-01-01	43.8157
2000-01-01	45.0604
2001-01-01	44.7840
2002-01-01	44.9205
2003-01-01	45.7292
2004-01-01	46.2433
2005-01-01	44.8318
2006-01-01	44.0245
2007-01-01	44.3471
2008-01-01	43.7305
2009-01-01	41.1143
2010-01-01	40.2190
2011-01-01	41.1122
2012-01-01	41.7007
2013-01-01	41.1671
2014-01-01	40.4244
2015-01-01	38.7059
2016-01-01	35.3842