Year	Number
2004-01-01	27.1392
2005-01-01	27.4151
2006-01-01	28.2798
2007-01-01	38.8308
2008-01-01	41.5919
2009-01-01	52.0680
2010-01-01	53.7014
2011-01-01	53.5897
2012-01-01	53.0250
2013-01-01	54.1474
2014-01-01	51.6732
2015-01-01	50.4306
2016-01-01	48.1060