Year	Percent
2000-01-01	3.33100065320947
2001-01-01	3.50989518143059
2002-01-01	3.76019237595712
2003-01-01	4.04380626260238
2004-01-01	4.18401501942435
2005-01-01	4.38095235765152
2006-01-01	3.39990096078519
2007-01-01	2.49564121352692
2008-01-01	2.54964892948092
2009-01-01	3.10250024938453
2010-01-01	3.52104721680429
2011-01-01	3.21438658661556
2012-01-01	3.12318770510020
2013-01-01	3.42288751422089
2014-01-01	3.48451070123756
2015-01-01	4.29539641390914
2016-01-01	4.67702425494197
2017-01-01	4.16215874910102