Is there any simulation or way of calculating dividends from the DEX at various levels of volume etc?  TIA

On this excel sheet, you can input the volume you estimate NVO may do on a daily basis and how much NVST you hold to find out the possible revenues you could have theoretically.
On the right of the table, there is an history of the top 20 volume since June.

https://docs.google.com/file/d/14r4-vS69G1CbtqRaVQYQ1z0z6BI8fVVO/edit?filetype=msexcel