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Not sure if it's possible to do a lot of the formatting now in the interactive chart tool to match output with title etc. If it is, I have absolutely no idea where it is! Think it looks better now anyway.
Here is my workflow !
I went through about 13 different ways of presenting the split headers before I settled on what I think is the best approach. Love this example of all the ways the same problem can be solved!
Plotting done with matplotib, also using python to clean up headers:
Here's my solution. I used the Linear Regression tool to estimate the year where the values converge (or at least that's what I believe the intercept to be).