Year	Number
2004-01-01	37
2005-01-01	66
2006-01-01	115
2007-01-01	159
2008-01-01	196
2009-01-01	310
2010-01-01	344
2011-01-01	332
2012-01-01	336
2013-01-01	374
2014-01-01	403
2015-01-01	395
2016-01-01	401
2017-01-01	401