Nice technique but we are losing when we remove filters on year and filters on region or product. Here is the result with removing filter, based on my filters the chart needs to change. We can compare our output with below result by filtering and by removing filtering. So our needs to match with this rendering below chart.
I have not selected anything in Region or Product, so not sure I follow the logic for those two filters. With Year, what would you be seeing when nothing is selected? Max across the two years for a particular region or year or max between both years?