Year	Percent
1999-01-01	21.4836
2000-01-01	20.5215
2001-01-01	15.3817
2002-01-01	13.1138
2003-01-01	19.3097
2004-01-01	22.0781
2005-01-01	24.0162
2006-01-01	26.3103
2007-01-01	28.5384
2008-01-01	13.5030
2009-01-01	25.7917
2010-01-01	28.6561
2011-01-01	22.8240
2012-01-01	24.2265
2013-01-01	23.4635
2014-01-01	25.0971
2015-01-01	22.1844
2016-01-01	30.0201