Year	Number
2004-01-01	36.4048
2005-01-01	51.1836
2006-01-01	59.6449
2007-01-01	68.9452
2008-01-01	63.4430
2009-01-01	66.8285
2010-01-01	85.5198
2011-01-01	95.0399
2012-01-01	111.8477
2013-01-01	128.7412
2014-01-01	150.9626
2015-01-01	151.9529