Year	Number
2004-01-01	12.0709
2005-01-01	11.9552
2006-01-01	11.8230
2007-01-01	17.0916
2008-01-01	18.6838
2009-01-01	21.1165
2010-01-01	25.2262
2011-01-01	27.5879
2012-01-01	28.1265
2013-01-01	35.3491
2014-01-01	41.5755
2015-01-01	41.1208
2016-01-01	47.0768