Year	Percent
1996-01-01	33.5241
1997-01-01	27.3273
1998-01-01	30.8682
1999-01-01	29.9294
2000-01-01	30.2866
2001-01-01	30.2597
2002-01-01	31.6068
2003-01-01	28.2309
2004-01-01	25.3345
2005-01-01	19.7468
2006-01-01	17.6442
2007-01-01	15.0826
2008-01-01	17.9554
2009-01-01	21.6693
2010-01-01	20.0980
2011-01-01	21.1826
2012-01-01	19.8974
2013-01-01	19.2339
2014-01-01	19.9170
2015-01-01	19.2339
2016-01-01	20.1058