Year	Percent
1999-01-01	1.71
2000-01-01	1.55
2001-01-01	1.76
2002-01-01	2.17
2003-01-01	2.21
2004-01-01	2.13
2005-01-01	2.08
2006-01-01	2.26
2007-01-01	2.61
2008-01-01	2.63
2009-01-01	3.08
2010-01-01	3.18
2011-01-01	3.09
2012-01-01	3.15
2013-01-01	3.47
2014-01-01	5.08
2015-01-01	9.55
2016-01-01	7.52