Year	Percent
1999-01-01	3.200
2000-01-01	2.700
2001-01-01	2.500
2002-01-01	3.000
2003-01-01	4.200
2004-01-01	4.400
2005-01-01	4.500
2006-01-01	4.100
2007-01-01	3.700
2008-01-01	3.400
2009-01-01	4.200
2010-01-01	4.925
2011-01-01	4.500
2012-01-01	4.625
2013-01-01	4.900
2014-01-01	4.975
2015-01-01	4.900
2016-01-01	5.100
2017-01-01	4.950