Year	Percent
2000-01-01	30.51
2001-01-01	27.26
2002-01-01	27.40
2003-01-01	25.70
2004-01-01	23.98
2005-01-01	28.54
2006-01-01	37.00
2007-01-01	36.71
2008-01-01	24.39
2009-01-01	31.06
2010-01-01	44.90
2011-01-01	39.03
2012-01-01	49.02
2013-01-01	61.81
2014-01-01	61.53
2015-01-01	67.31
2016-01-01	71.12