Year	Number
2004-01-01	3.6473
2005-01-01	3.9903
2006-01-01	4.4110
2007-01-01	5.0730
2008-01-01	5.6220
2009-01-01	6.6318
2010-01-01	7.8407
2011-01-01	11.0790
2012-01-01	13.5729
2013-01-01	17.5039
2014-01-01	14.6591
2015-01-01	18.3688
2016-01-01	20.2735