Year	Number
2004-01-01	214.6804
2005-01-01	259.4425
2006-01-01	327.5049
2007-01-01	365.1197
2008-01-01	362.7095
2009-01-01	443.7375
2010-01-01	386.6215
2011-01-01	449.2239
2012-01-01	465.5621
2013-01-01	488.2405
2014-01-01	521.3151
2015-01-01	541.3856
2016-01-01	570.5143
2017-01-01	583.6233