Year	Number
2004-01-01	0.1825
2005-01-01	0.2457
2006-01-01	0.2162
2007-01-01	0.2058
2008-01-01	0.2199
2009-01-01	0.2365
2010-01-01	0.2583
2011-01-01	0.2731
2012-01-01	0.3117
2013-01-01	0.6289
2014-01-01	1.1747
2015-01-01	2.7019
2016-01-01	3.4993