Year	Percent
1996-01-01	38.3806
1997-01-01	34.3392
1998-01-01	35.5771
1999-01-01	33.7968
2000-01-01	31.9212
2001-01-01	71.8588
2002-01-01	83.3857
2003-01-01	35.7741
2004-01-01	30.8652
2005-01-01	37.6279
2006-01-01	44.9881
2007-01-01	38.0034
2008-01-01	28.4853
2009-01-01	34.7379
2010-01-01	33.1645
2011-01-01	27.9728
2012-01-01	19.1234
2013-01-01	21.5653
2014-01-01	23.1771
2015-01-01	20.5353
2016-01-01	20.8522