Year	Percent
1998-01-01	17.3000000000000000
1999-01-01	13.4000000000000000
2000-01-01	7.7000000000000000
2001-01-01	6.2000000000000000
2002-01-01	5.6000000000000000
2003-01-01	5.0000000000000000
2004-01-01	3.3000000000000000
2005-01-01	2.6000000000000000
2006-01-01	2.4000000000000000
2007-01-01	2.5000000000000000
2008-01-01	3.8000000000000000
2009-01-01	9.5000000000000000
2010-01-01	8.2343200000000000
2011-01-01	6.5901399999999990
2012-01-01	6.0266500000000000
2013-01-01	6.0006900000000005
2014-01-01	6.7309700000000000
2015-01-01	8.3472300000000000
2016-01-01	9.4447400000000000