Year	Percent
1999-01-01	37.7460000000000000
2000-01-01	38.7260000000000000
2001-01-01	35.3655000000000000
2002-01-01	28.2036000000000000
2003-01-01	21.5821000000000000
2004-01-01	15.0363000000000000
2005-01-01	7.4469400000000000
2006-01-01	8.6311100000000010
2007-01-01	5.5858000000000000
2008-01-01	3.3705300000000005
2009-01-01	3.5456199999999995
2010-01-01	3.5675000000000000
2011-01-01	2.3625100000000000
2012-01-01	4.0776500000000000
2013-01-01	5.3063199999999995
2014-01-01	8.0694400000000000
2015-01-01	9.2186100000000000
2016-01-01	11.8993000000000000