Year	Number
2004-01-01	0.9555
2005-01-01	1.1048
2006-01-01	1.6408
2007-01-01	2.0377
2008-01-01	2.4503
2009-01-01	2.8356
2010-01-01	3.0586
2011-01-01	3.2881
2012-01-01	3.2805
2013-01-01	3.3573
2014-01-01	3.4598
2015-01-01	3.6518
2016-01-01	3.6221