Year	Number
2006-01-01	8
2007-01-01	57
2008-01-01	106
2009-01-01	170
2010-01-01	237
2011-01-01	446
2012-01-01	980
2013-01-01	1025
2014-01-01	1477
2015-01-01	1830
2016-01-01	3346
2017-01-01	1225