What is the maximum supply of taraxa?

Excuse me, could you please clarify for me the maximum supply of Taraxa? I understand that cryptocurrencies often have a limited or predetermined supply, so I'm curious to know what the upper limit is for Taraxa tokens. Is there a specific number of Taraxa tokens that will ever be in circulation, or is the supply subject to change over time? Thank you for your assistance in understanding this important aspect of the Taraxa ecosystem.