Year	Number
2004-01-01	21.5502
2005-01-01	21.9912
2006-01-01	45.8678
2007-01-01	44.8691
2008-01-01	44.5422
2009-01-01	41.9065
2010-01-01	41.5503
2011-01-01	41.3546
2012-01-01	38.9607
2013-01-01	38.5839
2014-01-01	37.9957
2015-01-01	37.5208
2016-01-01	37.0600