Year	Percent
1999-01-01	54.2154
2000-01-01	43.1275
2001-01-01	49.3049
2002-01-01	49.2801
2003-01-01	46.3826
2004-01-01	41.5513
2005-01-01	36.4943
2006-01-01	32.3295
2007-01-01	33.5358
2008-01-01	32.2600
2009-01-01	42.6352
2010-01-01	38.5392
2011-01-01	30.5279
2012-01-01	30.2512
2013-01-01	33.4946
2014-01-01	36.5067
2015-01-01	45.5685
2016-01-01	49.9158