Year	Percent
1999-01-01	28.1699
2000-01-01	34.4060
2001-01-01	29.1141
2002-01-01	20.0386
2003-01-01	23.8966
2004-01-01	26.0281
2005-01-01	33.4160
2006-01-01	46.6785
2007-01-01	49.0757
2008-01-01	24.1111
2009-01-01	35.8100
2010-01-01	42.2526
2011-01-01	37.5623
2012-01-01	49.4291
2013-01-01	60.0827
2014-01-01	61.2991
2015-01-01	70.9361
2016-01-01	74.7435