What is the total supply of Streamr?

Could you please explain to me what the total supply of Streamr is? I'm particularly interested in knowing if there's a fixed amount of Streamr tokens in circulation or if the supply can potentially increase over time. Understanding the total supply is crucial for me to assess the potential value and scarcity of the token, as well as its potential for appreciation in the future. Additionally, could you provide any insights into how the total supply of Streamr has been determined and if there are any plans to adjust it in the future?