What is the circulating supply of SHX?

Excuse me, could you please explain to me what the circulating supply of SHX is? I'm interested in understanding how this metric affects the overall value and availability of SHX tokens in the market. Is it a fixed number or does it change over time? And how does it relate to the total supply and other key metrics like market capitalization? I'd really appreciate a clear and concise answer to help me better grasp the concept.