Year	Percent
1999-01-01	6.7084800000000010
2000-01-01	13.1148000000000000
2001-01-01	10.5023000000000000
2002-01-01	7.5416000000000000
2003-01-01	8.9296800000000010
2004-01-01	10.3125000000000000
2005-01-01	11.1757000000000000
2006-01-01	14.7995000000000000
2007-01-01	14.2124000000000000
2008-01-01	5.7998400000000006
2009-01-01	8.2887300000000010
2010-01-01	9.6202300000000010
2011-01-01	7.6538400000000000
2012-01-01	10.3200000000000000
2013-01-01	14.0437000000000000
2014-01-01	15.3841000000000000
2015-01-01	20.4248000000000000
2016-01-01	19.8842000000000000