Attached are the skill spreadsheets as they were originally posted July 28 2020. The original thread thread is begin updated beginning July 29 2021 with corrected/updated spreadsheets.
Attached is the Python code that I used to generate the histogram images from the CSV spreadsheet files. Now, I'm a capable but not a superb Python programmer. The code is pretty elementary, and could certainly have been made more elegant with idioms or other code shortcuts. But it did the job.