Year	Percent
2003-01-01	3.10418514749564
2004-01-01	2.92951870983395
2005-01-01	2.47343556228604
2006-01-01	3.05537652139052
2007-01-01	2.26149190453562
2008-01-01	2.56194758512543
2009-01-01	5.68347893128646
2010-01-01	6.75145053674574
2011-01-01	6.19193073522599
2012-01-01	5.63978828362403
2013-01-01	5.10872467154087
2014-01-01	4.76449671355140
2015-01-01	4.04360582269094
2016-01-01	3.06493002982754
2017-01-01	2.72467089934351