Year	Number
2004-01-01	0.1321
2005-01-01	0.2567
2006-01-01	0.3748
2007-01-01	0.4859
2008-01-01	1.1808
2009-01-01	1.8358
2010-01-01	1.8947
2011-01-01	2.2780
2012-01-01	2.4261
2013-01-01	2.6656
2014-01-01	2.5908
2015-01-01	3.1967
2016-01-01	3.1129