Year	Percent
2000-01-01	3.89917327907898
2001-01-01	3.19122181781819
2002-01-01	2.30872316074912
2003-01-01	2.61179672557339
2004-01-01	2.71867791937647
2005-01-01	3.08263160981016
2006-01-01	3.06051456240395
2007-01-01	2.70660859662754
2008-01-01	2.55768875492640
2009-01-01	2.79675657194420
2010-01-01	3.36805894162985
2011-01-01	2.96138180082048
2012-01-01	2.99606203692869
2013-01-01	2.77105587706596
2014-01-01	2.92714391525534
2015-01-01	3.32924389994508
2016-01-01	3.22218388313430
2017-01-01	2.80626672300191