Year	Number
2004-01-01	0.5217
2005-01-01	1.0469
2006-01-01	1.4030
2007-01-01	1.9682
2008-01-01	2.3832
2009-01-01	2.7888
2010-01-01	3.2836
2011-01-01	3.5693
2012-01-01	4.0775
2013-01-01	4.7600
2014-01-01	6.3210
2015-01-01	6.2766