Year	Number
2004-01-01	149
2005-01-01	172
2006-01-01	196
2007-01-01	216
2008-01-01	229
2009-01-01	263
2010-01-01	298
2011-01-01	316
2012-01-01	323
2013-01-01	368
2014-01-01	463
2015-01-01	484