Year	Number
2008-01-01	31.6346
2009-01-01	33.9127
2010-01-01	34.6670
2011-01-01	35.9960
2012-01-01	37.5135
2013-01-01	40.2472
2014-01-01	40.4481
2015-01-01	41.0222
2016-01-01	42.0555
2017-01-01	43.2571