Speed of sales in each zone? (How fast is each zone filing up?)

Hi all,

I'm trying to make a line chart that shows a running percentage of capacity sold for each zone in a facility. Each zone has a different number of seats, so it has to be percentage sold as opposed to just a running sum to properly show which is filling first. Ideally I think I also want this averaged across the perfs in a production season, but I haven't gotten that far yet. 

The formula I've landed on doesn't seem quite right:

( (RSUM( ( [Total Ticket Paid/Reserved Count] , [Zone Group] ) / ( [Total Seat Count] , [Zone Group] ))) )

I have a separate value added for each zone and filtered each down. 

In dashboard filters I have season type / season / production season and I've selected only one. Also perf status not cancelled, constituent ID not -999999.

I have days in order date on the X axis. I (theoretically) have percentage sold on the Y axis, though it goes above 100% so I don't think this is working properly. 

I have also tried 

  •  (RSUM( [Total Ticket Paid/Reserved Count]    ) / [Total Seat Count] )  
  • (RSUM( [Total Ticket Paid/Reserved Count]  /  [Total Seat Count]  ))
  •  (RSUM( [Total Ticket Count] /  [Total Seat Count]  )) 
  •  (RSUM( [Total Ticket Paid/Reserved Count]   )/  [Total Seat Count] )  and then adding zone group to the "break by" section -- Tess Analytics crashed

And those didn't seem right either. Any ideas?