Number of factories

879
877
875
872
870
868
866
864
861
859
857













































































































































































































































































17181920212223242526

The X-axis in the diagram shows:  Days
The Y-axis in the diagram shows:  Number of factories
 X:    17  18  19  20  21 
 Y:    866   865  868  867  857 
 X:    22  23  24  25   26 
 Y:    859  860  873  877  879