Year	Percent
1999-01-01	0.21227400000000000
2000-01-01	0.21178400000000003
2001-01-01	0.20000400000000000
2002-01-01	0.21539600000000000
2003-01-01	0.20498800000000000
2004-01-01	0.19143400000000000
2005-01-01	0.16750000000000000
2006-01-01	0.17246000000000000
2007-01-01	0.17158900000000002
2008-01-01	0.14892200000000000
2009-01-01	0.15926300000000002
2010-01-01	0.15108700000000000
2011-01-01	0.14413700000000000
2012-01-01	0.14417500000000000
2013-01-01	0.14126100000000000
2014-01-01	0.12449100000000000
2015-01-01	0.13409700000000000
2016-01-01	0.12316200000000000