The stats are for you to understand how your music is performing on Audiomack in general - as a whole - next to all other artists who uploaded music in a given week, month or all time.
You can go to this page and select different time periods i.e. this month to see a breakdown of how your rankings are calculated: https://audiomack.com/stats/music
You can see all songs ranking here: https://audiomack.com/songs/month and even filter by week or month and genres.