Year	Percent
1999-01-01	51.1662
2000-01-01	38.1000
2001-01-01	28.3000
2002-01-01	23.0016
2003-01-01	22.3954
2004-01-01	26.0784
2005-01-01	30.5286
2006-01-01	42.8669
2007-01-01	27.9902
2008-01-01	33.5168
2009-01-01	25.8923
2010-01-01	37.1845
2011-01-01	24.3717
2012-01-01	23.4179
2013-01-01	25.2889
2014-01-01	25.2568
2015-01-01	27.4093
2016-01-01	29.7276