Year	Percent
1998-01-01	0.059757000000000005
1999-01-01	0.142535000000000000
2000-01-01	0.169027999999999980
2001-01-01	0.145472000000000000
2002-01-01	0.138016000000000000
2003-01-01	0.137273000000000000
2004-01-01	0.174889000000000020
2005-01-01	0.175123000000000000
2006-01-01	0.188836000000000000
2007-01-01	0.232096000000000000
2008-01-01	0.251107000000000000
2009-01-01	0.267014000000000000
2010-01-01	0.285888000000000030
2011-01-01	0.297257999999999970
2012-01-01	0.312571000000000000
2013-01-01	0.353930000000000000
2014-01-01	0.406006000000000000
2015-01-01	0.451162000000000000