Year	Number
2004-01-01	1.5365
2005-01-01	2.5768
2006-01-01	3.4119
2007-01-01	6.6552
2008-01-01	7.3985
2009-01-01	14.6755
2010-01-01	13.3835
2011-01-01	14.3710
2012-01-01	12.9667
2013-01-01	8.9466
2014-01-01	11.4201
2015-01-01	18.5669
2016-01-01	22.1513