What is the circulating supply of AGLD?

Could you please elaborate on the circulating supply of AGLD? I understand that it's an important metric in assessing the value and liquidity of a cryptocurrency, but I'm not entirely sure what it entails. Specifically, how is the circulating supply of AGLD determined? Is it fixed or does it fluctuate over time? And what factors can influence its value and market capitalization? Your insights would be greatly appreciated.