Year	Percent
2000-01-01	36.9869360615505
2001-01-01	38.4641412077678
2002-01-01	39.4115228958523
2003-01-01	39.5820029869700
2004-01-01	40.1564768184644
2005-01-01	39.2098067505330
2006-01-01	35.9090587618010
2007-01-01	33.1604714368122
2008-01-01	30.9789884394425
2009-01-01	29.6148302704040
2010-01-01	30.1387105901506
2011-01-01	29.7833001510537
2012-01-01	30.7328595380772
2013-01-01	30.3427449576827
2014-01-01	32.2983434918818
2015-01-01	33.7897128229288
2016-01-01	34.2747936636519
2017-01-01	34.2480941250203