Year	Percent
1997-01-01	37.0394
1998-01-01	34.8649
1999-01-01	41.7331
2000-01-01	63.7980
2001-01-01	54.1817
2002-01-01	20.1295
2003-01-01	37.8738
2004-01-01	49.0286
2005-01-01	36.5144
2006-01-01	32.9722
2007-01-01	33.0367
2008-01-01	26.4148
2009-01-01	23.9615
2010-01-01	18.5024
2011-01-01	27.8696
2012-01-01	24.8776
2013-01-01	16.0686
2014-01-01	17.1011
2015-01-01	11.5768
2016-01-01	17.3503