Year	Percent
1998-01-01	36.5865
1999-01-01	32.1529
2000-01-01	32.0000
2001-01-01	35.9000
2002-01-01	41.4398
2003-01-01	44.7348
2004-01-01	47.8383
2005-01-01	48.4198
2006-01-01	53.0737
2007-01-01	57.9223
2008-01-01	51.4069
2009-01-01	59.7211
2010-01-01	63.0707
2011-01-01	62.7449
2012-01-01	63.6013
2013-01-01	64.7466
2014-01-01	66.4558
2015-01-01	66.8944
2016-01-01	65.5945