Year	Percent
1999-01-01	3.211999893
2000-01-01	3.076999903
2001-01-01	4.172999859
2002-01-01	5.934999943
2003-01-01	6.394000053
2004-01-01	5.217000008
2005-01-01	4.302999973
2006-01-01	3.884999990
2007-01-01	2.869999886
2008-01-01	2.030999899
2009-01-01	3.094000101
2010-01-01	3.604000092
2011-01-01	4.374000072
2012-01-01	7.577000141
2013-01-01	10.491000180