Year	Number
2004-01-01	0.0159
2005-01-01	0.0609
2006-01-01	0.1181
2007-01-01	0.2088
2008-01-01	0.3024
2009-01-01	0.4524
2010-01-01	0.5321
2011-01-01	0.6201
2012-01-01	0.6422
2013-01-01	0.7124
2014-01-01	0.7588
2015-01-01	0.9298
2016-01-01	1.0742
2017-01-01	1.2747