datestart,period,numfeeders,numfeederyear
20/01/2018,a,6,a
3/2/18,b,20,b
9/3/18,c,28,c
3/4/18,d,28,c
12/5/18,e,20,d
8/10/18,f,10,e
18/02/2019,g,20,f
9/4/19,h,20,f