if EU will get 18-19k visas , then up to 46-48K case numbers may be interviewed .Aproximative visas quotas are like this :
Af 22000-24000
Eu 18000- 19000
As 6000- 7000
Sa 1500- 1600
Oc 1500-1600
2013 . 33+2K selecties got around 16K visas . 35/16= 2,19
each 2,19 selected got 1 visa .
19k visas * 2,19= 41610 selected we need to take 19k visas.
54000 case numbers / 46580 selected = 1,16 . each selected covers 1,16 case numbers
41610*1,16= 48238 !
so, to interview 41,6K winners cut-off must cover EU48238 case numbers