Year	Number
2004-01-01	0.4745
2005-01-01	0.5064
2006-01-01	0.5792
2007-01-01	0.6462
2008-01-01	1.0830
2009-01-01	1.3304
2010-01-01	1.8759
2011-01-01	2.3285
2012-01-01	2.7237
2013-01-01	3.5744
2014-01-01	6.3070
2015-01-01	7.5449