Year	Number
2004-01-01	157
2005-01-01	208
2006-01-01	238
2007-01-01	260
2008-01-01	294
2009-01-01	298
2010-01-01	255
2011-01-01	275
2012-01-01	277
2013-01-01	297
2014-01-01	311
2015-01-01	338
2016-01-01	474
2017-01-01	487