What is the circulating supply of YFII?

Excuse me, could you please clarify for me what exactly is meant by the term "circulating supply" when referring to YFII? Specifically, I'm wondering how this metric is calculated and what factors influence it. Additionally, is there a way to track the circulating supply of YFII in real-time or through reliable sources? And finally, what implications does the circulating supply of YFII have on its price and overall market performance? Thank you for your insights.