Year	Number
2004-01-01	0.2169
2005-01-01	0.2681
2006-01-01	0.3030
2007-01-01	4.4436
2008-01-01	4.7831
2009-01-01	5.2066
2010-01-01	13.2808
2011-01-01	28.4335
2012-01-01	31.9339
2013-01-01	37.3482
2014-01-01	30.2129