Year	Number
2004-01-01	0.0000
2005-01-01	0.0032
2006-01-01	0.0032
2007-01-01	0.0040
2008-01-01	0.0127
2009-01-01	0.0159
2010-01-01	0.0206
2011-01-01	0.0238
2012-01-01	0.0206
2013-01-01	0.0405
2014-01-01	0.0516
2015-01-01	0.0667
2016-01-01	0.0850
2017-01-01	0.0961