Total number of beings in the entire space as we know is constant? Increases? Decreases?

I am a being. So are you. According to Buddhism there is not soul and maybe there is nothing called myself which makes this a very tough question to ask. I am living my sansara. A never ending thought processes taking different forms (Human, Deva etc). This thought process or sansara does not overlap with any others or does not branch out. My theory is that the total number of beings (may not be the best word to use) or sansaras of different thought processes (again maybe wrong use of terminology but I hope you get the picture) does not change unless someone attains nibbhana/ becomes an arahath. Is this correct? or can it reduce without it being due to the passing of an arahath? Can it by any chance increase?