Paying Social Charges to independent contractors in France

Situation:
I manage an American musician/artist. He tours France every year playing concerts. We hire local French musicians to play in his band. We work with a local French booking agent. The booking agent has been charging us point 96 % (.96) on the fees we pay to French musicians for “Social Charges”. I understand this and I am happy to pay it, only recently the percentage jumped from (.96) to (1.96). I suspect the agent is trying to find some extra money for themselves and sneak it into our agreement.
Question:
Does anybody know what the correct percentage that we should be paying is? Is there a French government website that has the current social charges percentage?

Pole emploi and then these

And these. Obviously you consult the website not the incomplete picture - this one does the calculations for you

Thank you Véronique!