Year	Percent
1998-01-01	7.00005585664910
1999-01-01	6.19868227441754
2000-01-01	5.23064373614234
2001-01-01	4.65972425436216
2002-01-01	4.89245204609630
2003-01-01	4.90045464068780
2004-01-01	4.63617301321257
2005-01-01	4.34159215709168
2006-01-01	3.94818738021894
2007-01-01	3.51037717204698
2008-01-01	3.29223705875198
2009-01-01	4.71102838701019
2010-01-01	4.82156920111697
2011-01-01	4.46826560032522
2012-01-01	4.37078862171651
2013-01-01	4.60140201375370