Year	Percent
2002-01-01	3.6750000000000000
2003-01-01	3.6260000000000003
2004-01-01	3.8600000000000000
2005-01-01	3.2900000000000000
2006-01-01	4.2500000000000000
2007-01-01	4.9100000000000000
2008-01-01	5.0200000000000000
2009-01-01	5.5000000000000000
2010-01-01	6.1400000000000000
2011-01-01	6.8000000000000000
2012-01-01	7.2900000000000000
2013-01-01	0.8600000000000000
2014-01-01	0.8700000000000000
2015-01-01	0.9200000000000000