Year	Percent
1996-01-01	47.1314
1997-01-01	52.9329
1998-01-01	45.8984
1999-01-01	33.5466
2000-01-01	35.3091
2001-01-01	44.2565
2002-01-01	40.1800
2003-01-01	30.7409
2004-01-01	31.0225
2005-01-01	30.3953
2006-01-01	30.4651
2007-01-01	32.6811
2008-01-01	33.2208
2009-01-01	31.3302
2010-01-01	26.8663
2011-01-01	18.3261
2012-01-01	23.4983
2013-01-01	17.9258
2014-01-01	19.0002
2015-01-01	22.7409
2016-01-01	20.2460