Year	Number
2007-01-01	168.5900
2008-01-01	169.3314
2009-01-01	165.7758
2010-01-01	180.2012
2011-01-01	183.6157
2012-01-01	408.0387
2013-01-01	474.2978
2014-01-01	489.8636
2015-01-01	526.5734
2016-01-01	548.1896
2017-01-01	546.8164