Year	Number
2004-01-01	0.6027
2005-01-01	0.9539
2006-01-01	1.1860
2007-01-01	2.3652
2008-01-01	4.6714
2009-01-01	8.3445
2010-01-01	7.3316
2011-01-01	11.9135
2012-01-01	15.5801
2013-01-01	20.5628
2014-01-01	24.7027
2015-01-01	30.1144
2016-01-01	31.2070
2017-01-01	33.9197