Year	Number
2004-01-01	0.5977
2005-01-01	1.2997
2006-01-01	1.7877
2007-01-01	5.2485
2008-01-01	9.5682
2009-01-01	9.3951
2010-01-01	12.8853
2011-01-01	14.9854
2012-01-01	16.9960
2013-01-01	14.1778