Year	Percent
2000-01-01	53.0896089204686
2001-01-01	53.6169771897068
2002-01-01	53.1080775652281
2003-01-01	52.9821106553253
2004-01-01	53.5292471510336
2005-01-01	54.3541404684075
2006-01-01	55.4130024564989
2007-01-01	58.0501099598714
2008-01-01	55.6074398271285
2009-01-01	48.2821844947843
2010-01-01	45.5702151093455
2011-01-01	44.4293376998689
2012-01-01	44.1410848979299
2013-01-01	45.8364717881517