Year	Percent
1998-01-01	62.5482
1999-01-01	55.6613
2000-01-01	53.8000
2001-01-01	51.4000
2002-01-01	49.3661
2003-01-01	48.3540
2004-01-01	51.0454
2005-01-01	47.5702
2006-01-01	47.7665
2007-01-01	44.3948
2008-01-01	47.5433
2009-01-01	45.2384
2010-01-01	44.6174
2011-01-01	46.8680
2012-01-01	47.9376
2013-01-01	48.6768
2014-01-01	49.3490
2015-01-01	48.5482
2016-01-01	56.3780