Do you make this chart at the end of the month at one time or divide it into several steps and collect the data?
I am not sure that I fully understand your question, but regarding the charts I simply make them by taking data from Merit Dashboard and ninjastic.space.
Now, what happened in Greece? The people there got tired of handing out merits. It was amazing.
I guess they are just not that active and often they don't even have a single merit sent so it was a big surprise to see 30 being sent last month, and all for 1 post.