Year	Number
2004-01-01	0.0183
2005-01-01	0.0541
2006-01-01	0.1279
2007-01-01	0.2856
2008-01-01	0.5084
2009-01-01	0.6685
2010-01-01	1.0978
2011-01-01	1.4637
2012-01-01	3.4794
2013-01-01	3.2631
2014-01-01	4.7606