Year	Number
2004-01-01	0.3689
2005-01-01	13.7170
2006-01-01	21.1641
2007-01-01	27.5836
2008-01-01	41.5114
2009-01-01	63.8401
2010-01-01	59.5663
2011-01-01	76.2943
2012-01-01	378.9112
2013-01-01	450.8655
2014-01-01	482.8031
2015-01-01	526.0582