Year	Number
2004-01-01	15.5105
2005-01-01	27.7811
2006-01-01	37.4104
2007-01-01	59.9670
2008-01-01	63.8598
2009-01-01	43.3031
2010-01-01	37.9644
2011-01-01	36.9823
2012-01-01	41.2270
2013-01-01	46.7164
2014-01-01	51.5422
2015-01-01	49.6318
2016-01-01	40.3785
2017-01-01	64.4860