Year	Percent
1999-01-01	13.8949
2000-01-01	14.8916
2001-01-01	15.9466
2002-01-01	15.4461
2003-01-01	17.2868
2004-01-01	17.4635
2005-01-01	18.7185
2006-01-01	24.1043
2007-01-01	28.2596
2008-01-01	15.5423
2009-01-01	24.9107
2010-01-01	23.2197
2011-01-01	19.8883
2012-01-01	22.5426
2013-01-01	25.3483
2014-01-01	27.9006
2015-01-01	30.6147
2016-01-01	31.7466