Year	Number
2004-01-01	18.6433
2005-01-01	19.7774
2006-01-01	27.9630
2007-01-01	32.5445
2008-01-01	36.4619
2009-01-01	43.7001
2010-01-01	50.4970
2011-01-01	55.8187
2012-01-01	63.8317
2013-01-01	67.5085
2014-01-01	81.0310
2015-01-01	80.0468
2016-01-01	79.1573