Year	Number
2004-01-01	44.9168
2005-01-01	45.2865
2006-01-01	45.7486
2007-01-01	46.7652
2008-01-01	48.5675
2009-01-01	49.4455
2010-01-01	55.2218
2011-01-01	56.9778
2012-01-01	57.8558
2013-01-01	57.8558
2014-01-01	57.1627
2015-01-01	56.0536
2016-01-01	53.6969