Year	Percent
2003-01-01	3.65602471678682
2004-01-01	5.13853904282116
2005-01-01	4.48939319190922
2006-01-01	4.73170731707317
2007-01-01	4.06608839694570
2008-01-01	5.05049465829157
2009-01-01	5.11173245824126
2010-01-01	4.35164388852499
2011-01-01	4.89692724009384
2012-01-01	5.13828639966598
2013-01-01	5.83652074706171
2014-01-01	5.85488241327029
2015-01-01	6.65882621114482
2016-01-01	6.28592784584716
2017-01-01	5.51614606192672