Year	Number
2004-01-01	1.9664
2005-01-01	2.2893
2006-01-01	2.6587
2007-01-01	2.9857
2008-01-01	3.5609
2009-01-01	4.4611
2010-01-01	7.5906
2011-01-01	8.0766
2012-01-01	9.2723
2013-01-01	20.5844
2014-01-01	23.3052
2015-01-01	25.5051
2016-01-01	26.7612
2017-01-01	26.4975