Year	Percent
2000-01-01	2.01573555217942
2001-01-01	1.84472535210388
2002-01-01	2.10536233111597
2003-01-01	2.25741159302649
2004-01-01	2.18501104788479
2005-01-01	2.13503948298752
2006-01-01	2.21932321350655
2007-01-01	2.67211964739687
2008-01-01	3.59692475776465
2009-01-01	6.40444310982538
2010-01-01	7.18093028621067
2011-01-01	7.48271893055384
2012-01-01	7.48688989679837
2013-01-01	6.71042928268333