Definitely finding that second chart confusing. The Y-Axis on both sides goes to 100. Are they the same metric (redundant) or different ones? And of course t

Definitely finding that second chart confusing. The Y-Axis on both sides goes to 100. Are they the same metric (redundant) or different ones? And of course the bigger question is, what is it depicting? The preceding paragraph isn't helping in terms of context.