Year	Number
2004-01-01	0.6642
2005-01-01	0.6445
2006-01-01	0.6238
2007-01-01	1.3786
2008-01-01	1.6662
2009-01-01	1.6933
2010-01-01	2.0323
2011-01-01	2.4812
2012-01-01	2.6491
2013-01-01	3.2461
2014-01-01	3.4920
2015-01-01	3.6508