Year	Percent
1998-01-01	6.83551398818118
1999-01-01	6.02390602430583
2000-01-01	5.22549604257516
2001-01-01	4.60115069966816
2002-01-01	4.57987693146888
2003-01-01	4.52070900530339
2004-01-01	4.39663254409710
2005-01-01	4.20519745698840
2006-01-01	3.89925924453019
2007-01-01	3.48202405580094
2008-01-01	3.25467005509005
2009-01-01	4.15539275373252
2010-01-01	4.19835085722873
2011-01-01	3.89071722722771
2012-01-01	3.83629096621293
2013-01-01	4.04740479945380