Year	Percent
1996-01-01	51.1144
1997-01-01	45.9143
1998-01-01	43.7029
1999-01-01	40.6702
2000-01-01	44.6528
2001-01-01	43.2604
2002-01-01	43.9753
2003-01-01	46.5743
2004-01-01	39.7036
2005-01-01	36.9407
2006-01-01	36.8481
2007-01-01	34.3214
2008-01-01	37.9915
2009-01-01	33.4937
2010-01-01	39.6645
2011-01-01	43.7059
2012-01-01	39.1811
2013-01-01	45.2628
2014-01-01	46.8881
2015-01-01	57.0498
2016-01-01	56.5912