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I think there's a bigger design issue at the heart of this problem. Using multiple pie charts to show change over time is a bit like building a house with nails and a rock - sure it can be done, but it's tedious, frustrating, and definitely the wrong tool for the job. In pie charts beyond 4 or 5 wedges it becomes very difficult to visually perceive size differences. The simplest and most effective way to show something like this over time is going to be with a line graph. If you absolutely MUST use multiple pie charts, I imagine there's a way (in a hover tooltip, if nothing else) but I strongly advise against the pie chart method, for what it's worth.
Thanks for your notes regards this discussion. I, along with other Tableau community experts, agree that it is not a right chart type to use, but this is what I was requested to built. Originally, I asked in other discussion thread and Jonathan Drummey and Andrew Watson were able to answer my question and give a solution for it since I still needed the same look. Here is link to that discussion:Can I calculate a shape as an 'up' or 'down' arrow depending on a quick table calculation?