What is the max supply of Ampleforth?

Can you clarify for me, what exactly is the maximum supply of Ampleforth tokens that will ever be in circulation? Is there a specific cap or limit set by the protocol, or does the supply fluctuate based on certain economic factors? Understanding the maximum supply is crucial in assessing the potential value and scarcity of the token, so I'd appreciate a detailed explanation of how this aspect of Ampleforth works.