Year	Percent
2001-01-01	2.16699398769567
2002-01-01	2.22862880994596
2003-01-01	2.49561717378781
2004-01-01	2.95542255598416
2005-01-01	3.59933142017811
2006-01-01	3.58489011896920
2007-01-01	3.22705405472316
2008-01-01	3.29077984716000
2009-01-01	3.99294512640623
2010-01-01	4.22255247536721
2011-01-01	3.89743187437539
2012-01-01	3.89977736395172
2013-01-01	4.02012529626407
2014-01-01	3.95215824051382