Year	Percent
1999-01-01	21.7808
2000-01-01	22.9978
2001-01-01	25.9081
2002-01-01	29.4744
2003-01-01	32.2032
2004-01-01	36.6435
2005-01-01	38.4446
2006-01-01	43.6755
2007-01-01	49.0089
2008-01-01	49.8923
2009-01-01	52.3316
2010-01-01	55.6220
2011-01-01	56.7430
2012-01-01	58.3928
2013-01-01	57.9735
2014-01-01	58.9806
2015-01-01	57.5958
2016-01-01	57.9258