In general you need more information.How to calculate how much is needed for CG missions?
For example, if 55mil bounties is collected by close to 8k commanders, how much do I need to collect to be in 75%?
It's not possible to calculate since there's no way of knowing how many commanders contributed what to the CG. As mentioned the CG threads will usually have people posting what it took them to pass a threshold at a given moment in the CG. That's about as good as it gets.