Year	Number
2004-01-01	11.8077
2005-01-01	12.1023
2006-01-01	12.8983
2007-01-01	13.6045
2008-01-01	14.3305
2009-01-01	14.8830
2010-01-01	16.3790
2011-01-01	16.8299
2012-01-01	17.3766
2013-01-01	17.9985
2014-01-01	19.0800
2015-01-01	19.7961
2016-01-01	20.4568