How is a servers average players calculated?

[Yukona]

Just curious, How, on the server status page, is a servers average players calculated? Ive been watching P99's average go up, day after day, but it never seems to go down in off peak hours... Is the average the average of the last... 24 hours? last week? month? or what?

[Secrets]

I believe it's calculated based on the number of players that are online whenever a server update tic is sent. I don't think it's based on uptime or anything, but only when the server is online does that count.