Paying Social Charges to independent contractors in France

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.
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!