Year	Percent
2008-01-01	2.1216500000000000
2009-01-01	2.2805800000000000
2010-01-01	2.5294700000000000
2011-01-01	2.5775900000000003
2012-01-01	2.8536500000000000
2013-01-01	2.9166100000000000
2014-01-01	2.6157400000000000
2015-01-01	2.3779700000000000
2016-01-01	2.4461500000000000