Year	Percent
1999-01-01	2.8415600000000000
2000-01-01	3.9564100000000000
2001-01-01	2.8049600000000000
2002-01-01	3.5021800000000000
2003-01-01	1.8521400000000001
2004-01-01	2.8562500000000000
2005-01-01	4.3856699999999990
2006-01-01	6.2339900000000000
2007-01-01	7.5062899999999990
2008-01-01	4.1599100000000000
2009-01-01	4.9217699999999995
2010-01-01	5.3240000000000000
2011-01-01	4.1638900000000000
2012-01-01	4.9875000000000000
2013-01-01	5.4440000000000000
2014-01-01	5.9426700000000000
2015-01-01	7.0882399999999990
2016-01-01	7.3183899999999990