Year	Percent
1998-01-01	52.2269
1999-01-01	54.0956
2000-01-01	47.3000
2001-01-01	36.4000
2002-01-01	42.0837
2003-01-01	19.0744
2004-01-01	29.5502
2005-01-01	42.7885
2006-01-01	47.4492
2007-01-01	52.5957
2008-01-01	42.0510
2009-01-01	47.6889
2010-01-01	54.3104
2011-01-01	56.1649
2012-01-01	58.7819
2013-01-01	54.0381
2014-01-01	54.2456
2015-01-01	54.6961
2016-01-01	55.3408