What is the circulating supply of Starknet?

Could you please explain to me what exactly is meant by the "circulating supply" of Starknet, and how can one determine the current amount that is in circulation? Is there a specific way to track this information, or is it something that changes frequently and requires ongoing monitoring? Additionally, how does the circulating supply of Starknet compare to other cryptocurrencies in terms of availability and distribution? Thank you for your clarification.