Year	Number
2004-01-01	1.8181
2005-01-01	1.7346
2006-01-01	1.4261
2007-01-01	1.4513
2008-01-01	1.4815
2009-01-01	1.5017
2010-01-01	1.5433
2011-01-01	1.6904
2012-01-01	1.8746
2013-01-01	2.7622
2014-01-01	3.4169
2015-01-01	3.3788
2016-01-01	3.4106