Year	Number
2004-01-01	0.3276
2005-01-01	0.6047
2006-01-01	0.6974
2007-01-01	0.8999
2008-01-01	1.2306
2009-01-01	1.5595
2010-01-01	1.8244
2011-01-01	2.3776
2012-01-01	2.6221
2013-01-01	3.2089
2014-01-01	3.6408