Year	Percent
1999-01-01	28.8370
2000-01-01	37.0493
2001-01-01	39.9668
2002-01-01	45.1118
2003-01-01	41.2439
2004-01-01	45.4022
2005-01-01	37.6355
2006-01-01	41.1526
2007-01-01	44.2654
2008-01-01	35.3188
2009-01-01	47.7434
2010-01-01	45.3668
2011-01-01	41.8384
2012-01-01	46.8755
2013-01-01	43.6905
2014-01-01	45.9484
2015-01-01	54.8042
2016-01-01	57.3318