If I solve this can I get a tap on a back?
Just kidding.. here is the answer.
Its not possible to get them all gray but they can collide at their maximum/minimum. Also animation doesnt spends 1s on gray so... min/max
Eevery 8s goes a birth and 12s death
We need a real/whole number to get max min. Lets focus on death bar. From begining it needs 3*12 to get full bar with birth and that means that when death bar goes 3 times full animation it will collide with max bar with birth.
Now we 3x death and match with One international migrant.
3*12/33 = 36/33 = 12/11... again we 11*12/11 and we get that 3*11*12 is the time when death birth and One international migrant collide..
Net gain of one person every
.. same thing and we add 13*(formla above)
13*396=5148s that all bars reach (max/min) or the GRAY area
edit: This is example when it oscilates (amplitude) but knowing the exact time i need to count exact time for every of their pos. so i can tell you when it will accure. If you really want it tell me.