Year	Percent
1998-01-01	23.3010
1999-01-01	16.7273
2000-01-01	40.0568
2001-01-01	46.3294
2002-01-01	41.5617
2003-01-01	55.5639
2004-01-01	43.9626
2005-01-01	30.7692
2006-01-01	45.0370
2007-01-01	52.6995
2008-01-01	50.9335
2009-01-01	51.9449
2010-01-01	51.7283
2011-01-01	68.9096
2012-01-01	59.7884
2013-01-01	40.7085
2014-01-01	54.0494
2015-01-01	44.9478
2016-01-01	62.0406