Thanks so much; it was great to see you back. Two points:
1. The issue of what minus means before a number might be confusing for people as they look at the chart for the first time. They have to search for its definition in your text and could get discouraged. Might you consider explaining this value (and what -3 means compared to -13) at the top of your chart? It’s that important, and we are an impatient society.
Also, I’m not on Facebook, please continue to make the chart and all your valuable information available through email.