Year	Number
2004-01-01	4.5936
2005-01-01	4.5936
2006-01-01	4.5936
2007-01-01	6.7138
2008-01-01	7.4205
2009-01-01	8.4806
2010-01-01	10.2473
2011-01-01	11.3074
2012-01-01	11.6608
2013-01-01	14.8410
2014-01-01	17.6678
2015-01-01	17.6678
2016-01-01	20.4947