Year	Number
2004-01-01	0.5835
2005-01-01	0.5664
2006-01-01	0.5505
2007-01-01	1.0703
2008-01-01	1.0405
2009-01-01	1.2646
2010-01-01	1.2297
2011-01-01	2.1544
2012-01-01	2.3299
2013-01-01	2.4945
2014-01-01	2.8697
2015-01-01	2.7936
2016-01-01	3.1411