Year	Number
2004-01-01	192.1584
2005-01-01	227.5440
2006-01-01	275.6501
2007-01-01	329.6731
2008-01-01	372.5259
2009-01-01	391.8139
2010-01-01	410.5319
2011-01-01	447.1783
2012-01-01	461.6500
2013-01-01	408.9210
2014-01-01	422.1763
2015-01-01	501.9441
2016-01-01	533.4131
2017-01-01	532.8307