Year	Percent
1999-01-01	3.930
2000-01-01	3.995
2001-01-01	3.110
2002-01-01	2.800
2003-01-01	3.620
2004-01-01	4.120
2005-01-01	3.240
2006-01-01	3.660
2007-01-01	4.140
2008-01-01	2.940
2009-01-01	3.735
2010-01-01	2.590
2011-01-01	2.600
2012-01-01	3.145
2013-01-01	2.760
2014-01-01	3.190
2015-01-01	5.195