Year	Number
2004-01-01	58.8931
2005-01-01	57.9878
2006-01-01	54.6232
2007-01-01	55.0200
2008-01-01	54.7638
2009-01-01	53.9191
2010-01-01	52.8681
2011-01-01	51.8621
2012-01-01	47.9395
2013-01-01	54.9539