Year	Number
2004-01-01	12.4405
2005-01-01	12.6475
2006-01-01	12.8752
2007-01-01	13.1443
2008-01-01	13.5790
2009-01-01	14.0551
2010-01-01	14.3656
2011-01-01	15.2349
2012-01-01	15.2556
2013-01-01	17.2428
2014-01-01	17.3877
2015-01-01	19.1886
2016-01-01	19.5405