Year	Percent
1998-01-01	7.717500000000000
1999-01-01	6.373230000000000
2000-01-01	4.537750000000000
2001-01-01	4.503760000000000
2002-01-01	4.978070000000000
2003-01-01	5.997809999999999
2004-01-01	7.586900000000000
2005-01-01	12.556000000000000
2006-01-01	33.271000000000000
2007-01-01	40.801400000000000
2008-01-01	25.128400000000000
2009-01-01	20.334800000000000
2010-01-01	18.614900000000000
2011-01-01	13.040600000000000
2012-01-01	10.977600000000000
2013-01-01	10.446800000000000
2014-01-01	10.319900000000000
2015-01-01	13.890800000000000
2016-01-01	22.758200000000000
2017-01-01	27.570500000000000