Year	Percent
1998-01-01	2.35137444492788
1999-01-01	2.27831433142930
2000-01-01	1.87213016869334
2001-01-01	1.84867794348740
2002-01-01	2.40762551416228
2003-01-01	3.15794889278598
2004-01-01	3.33970647467687
2005-01-01	3.81689683615901
2006-01-01	3.76273968448977
2007-01-01	3.79818509402201
2008-01-01	3.72300890100785
2009-01-01	4.99382890725170
2010-01-01	5.49328075863753
2011-01-01	6.95147016877185
2012-01-01	8.66861364121196
2013-01-01	8.77416617244450
2014-01-01	7.33908115459832