Year	Number
2004-01-01	0.4861
2005-01-01	1.0147
2006-01-01	1.0959
2007-01-01	1.1418
2008-01-01	1.2306
2009-01-01	1.3224
2010-01-01	1.7093
2011-01-01	1.7574
2012-01-01	1.8598
2013-01-01	1.9872
2014-01-01	2.0104