Year	Percent
2003-01-01	2.96943231441048
2004-01-01	3.64267129228101
2005-01-01	3.51328191945158
2006-01-01	3.56211989574283
2007-01-01	3.55796546173034
2008-01-01	4.31322517151607
2009-01-01	4.37532187588432
2010-01-01	3.78981828115497
2011-01-01	3.85554619548618
2012-01-01	4.51734390883557
2013-01-01	5.43815159444262
2014-01-01	5.92004755656058
2015-01-01	6.11809430663668
2016-01-01	6.01947413162605
2017-01-01	5.52437060128157