Year	Percent
1996-01-01	48.6944
1997-01-01	43.2750
1998-01-01	47.0376
1999-01-01	53.3281
2000-01-01	59.8968
2001-01-01	59.9084
2002-01-01	59.9370
2003-01-01	53.0558
2004-01-01	44.9516
2005-01-01	42.8801
2006-01-01	43.4671
2007-01-01	49.3454
2008-01-01	38.7748
2009-01-01	30.7876
2010-01-01	30.6343
2011-01-01	29.9115
2012-01-01	46.8084
2013-01-01	43.3226
2014-01-01	38.2423
2015-01-01	42.2901
2016-01-01	37.4314