 Ariko rero, ikizwi coco n uko igitigiri cabafungura inyama kwisi ciyongereye incuro 5 muri iyi myaka 50 irangiye, aho cavuye ku matoni imiliyoni 70 yinyama zaribwa mu myaka ya 1960-1970, ubu kikaba kigeze ku matoni imiliyoni 330 yinyama ziribwa. 