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	3.38445117958333
2006-01-01	3.41705606283333
2007-01-01	3.47657313850000
2008-01-01	3.87412799333333
2009-01-01	5.47566637116667
2010-01-01	5.44802448675000
2011-01-01	5.21552154650000
2012-01-01	4.93246206875000
2013-01-01	4.87821097475000
2014-01-01	4.81086622741667
2015-01-01	4.24308490800000
2016-01-01	3.83959459333333
2017-01-01	3.29913002916667