Year	Number
2004-01-01	40.4259
2005-01-01	48.9715
2006-01-01	50.7303
2007-01-01	49.0656
2008-01-01	50.3517
2009-01-01	39.9562
2010-01-01	35.4282
2011-01-01	31.0719
2012-01-01	29.1943
2013-01-01	27.9054
2014-01-01	27.3423
2015-01-01	26.1335
2016-01-01	27.0778