Presence is read from the game, so this is empty both when nobody is playing and when
the sync has not caught up yet. The two look the same from here, which is why the count
above shows a dash rather than a zero.
Every figure is summed from the values Habbo reports, across all hotels. Tracking began at
different times for different stats, so a total only covers the period that stat has been
collected — the leaderboards show their own start date where one is known.