Year	Percent
1996-01-01	45.6878
1997-01-01	46.3447
1998-01-01	42.9767
1999-01-01	40.8698
2000-01-01	35.5485
2001-01-01	27.4289
2002-01-01	43.8854
2003-01-01	42.7771
2004-01-01	62.9286
2005-01-01	51.3298
2006-01-01	46.9154
2007-01-01	49.9378
2008-01-01	52.3636
2009-01-01	53.9571
2010-01-01	30.3163
2011-01-01	32.5137
2012-01-01	24.5316
2013-01-01	23.4315
2014-01-01	30.7517
2015-01-01	30.8266
2016-01-01	28.3077