Year	Percent
1998-01-01	41.6358
1999-01-01	41.1842
2000-01-01	41.9000
2001-01-01	40.0000
2002-01-01	41.3502
2003-01-01	51.6348
2004-01-01	52.1709
2005-01-01	60.7788
2006-01-01	62.4575
2007-01-01	67.9783
2008-01-01	56.3102
2009-01-01	66.9806
2010-01-01	71.8567
2011-01-01	74.3270
2012-01-01	73.6566
2013-01-01	73.0991
2014-01-01	72.3006
2015-01-01	73.4176
2016-01-01	73.4699