Year	Percent
1996-01-01	14.0884
1997-01-01	18.2844
1998-01-01	17.8571
1999-01-01	12.6679
2000-01-01	18.6490
2001-01-01	16.6065
2002-01-01	23.2667
2003-01-01	51.9829
2004-01-01	57.9323
2005-01-01	53.2517
2006-01-01	44.1985
2007-01-01	43.5223
2008-01-01	40.9784
2009-01-01	35.3052
2010-01-01	28.0681
2011-01-01	32.1058
2012-01-01	38.8862
2013-01-01	38.4831
2014-01-01	37.7289
2015-01-01	50.4220
2016-01-01	41.1635