Year	Number
2004-01-01	50.6404
2005-01-01	53.9076
2006-01-01	52.5231
2007-01-01	51.0081
2008-01-01	45.6591
2009-01-01	47.9407
2010-01-01	51.2665
2011-01-01	50.6922
2012-01-01	58.0501
2013-01-01	59.4800
2014-01-01	58.6468
2015-01-01	60.0907
2016-01-01	60.7302