Year	Percent
1996-01-01	41.9304
1997-01-01	37.0764
1998-01-01	39.7837
1999-01-01	39.8617
2000-01-01	39.4206
2001-01-01	35.2131
2002-01-01	34.3263
2003-01-01	39.4583
2004-01-01	32.7803
2005-01-01	32.7306
2006-01-01	38.4434
2007-01-01	36.9330
2008-01-01	31.0036
2009-01-01	24.3525
2010-01-01	18.4389
2011-01-01	19.5911
2012-01-01	17.1346
2013-01-01	16.6051
2014-01-01	15.5613
2015-01-01	13.7656
2016-01-01	11.8957