Year	Percent
1999-01-01	17.0649
2000-01-01	15.4236
2001-01-01	15.1073
2002-01-01	10.2287
2003-01-01	14.4655
2004-01-01	14.1776
2005-01-01	15.5577
2006-01-01	20.7462
2007-01-01	26.4238
2008-01-01	12.5859
2009-01-01	18.9388
2010-01-01	19.5381
2011-01-01	15.0576
2012-01-01	19.7956
2013-01-01	22.9781
2014-01-01	19.5834
2015-01-01	21.6835
2016-01-01	20.7019