Year	Percent
1998-01-01	13.7717000000000000
1999-01-01	14.3842000000000000
2000-01-01	10.0955000000000000
2001-01-01	9.0312100000000000
2002-01-01	7.5562800000000000
2003-01-01	8.3329399999999990
2004-01-01	6.9283899999999990
2005-01-01	6.5541500000000000
2006-01-01	7.0492399999999990
2007-01-01	7.0711400000000000
2008-01-01	6.2531400000000000
2009-01-01	8.3820199999999990
2010-01-01	6.8210200000000000
2011-01-01	7.3533100000000005
2012-01-01	7.7578400000000000
2013-01-01	5.7119300000000010
2014-01-01	4.1714000000000000
2015-01-01	3.8087900000000000
2016-01-01	5.8525100000000000