Year	Percent
1999-01-01	3.75047892720307
2000-01-01	3.13246450478684
2001-01-01	2.64818104422838
2002-01-01	3.10447279492729
2003-01-01	3.22272641331064
2004-01-01	3.54417153293203
2005-01-01	3.63005446202630
2006-01-01	3.56937924003190
2007-01-01	3.29661291363923
2008-01-01	2.98818626017264
2009-01-01	3.19028004539964
2010-01-01	3.40541389390612
2011-01-01	2.82811825786769
2012-01-01	2.92226303499296
2013-01-01	3.26651072176482
2014-01-01	3.19592868445301