Year	Percent
1999-01-01	1.56549171490691
2000-01-01	1.57762531326114
2001-01-01	1.58360304674762
2002-01-01	1.64959958981169
2003-01-01	1.81600824041321
2004-01-01	2.33254354120407
2005-01-01	2.39695400471120
2006-01-01	2.35012376769894
2007-01-01	2.27844025960501
2008-01-01	1.90816963951872
2009-01-01	2.13489163574499
2010-01-01	1.96847782561833
2011-01-01	2.02564780185463
2012-01-01	2.05475522723104
2013-01-01	2.35008500654262