Year	Number
2004-01-01	21.0950
2005-01-01	25.0860
2006-01-01	27.2447
2007-01-01	34.6489
2008-01-01	41.7715
2009-01-01	43.5814
2010-01-01	39.7827
2011-01-01	40.2768
2012-01-01	40.5643
2013-01-01	42.4213
2014-01-01	41.8949
2015-01-01	42.9710
2016-01-01	44.2016
2017-01-01	43.6122