Year	Number
2004-01-01	56
2005-01-01	117
2006-01-01	163
2007-01-01	238
2008-01-01	300
2009-01-01	365
2010-01-01	446
2011-01-01	502
2012-01-01	593
2013-01-01	715
2014-01-01	980
2015-01-01	1004