Year	Percent
2001-01-01	2.35333333333333
2002-01-01	2.58250000000000
2003-01-01	2.93083333333333
2004-01-01	3.26000000000000
2005-01-01	3.35973342471837
2006-01-01	3.37642344393645
2007-01-01	3.42331236188742
2008-01-01	3.80423372380499
2009-01-01	5.37803625645144
2010-01-01	5.40020158440602
2011-01-01	5.21858965122549
2012-01-01	4.92588017722187
2013-01-01	4.91528847152051
2014-01-01	4.80497129193933
2015-01-01	4.25090625985616
2016-01-01	3.84937874482618
2017-01-01	3.32364833358208