Year	Number
2004-01-01	0.1429
2005-01-01	0.1429
2006-01-01	0.4287
2007-01-01	0.5716
2008-01-01	0.7145
2009-01-01	0.7860
2010-01-01	1.2504
2011-01-01	1.2862
2012-01-01	1.3576
2013-01-01	1.3576
2014-01-01	1.3934
2015-01-01	1.4648
2016-01-01	1.5005