Year	Number
2007-01-01	173.3412
2008-01-01	171.2890
2009-01-01	171.5826
2010-01-01	186.1085
2011-01-01	189.1223
2012-01-01	421.6649
2013-01-01	490.7886
2014-01-01	505.9751
2015-01-01	545.8451
2016-01-01	564.3578
2017-01-01	560.3449