Important thing to note. Here is the list of SRD monsters that are CR 16:
Angel, Planetar
Archon, Hound Hero
Black Dragon, Old
Blue Dragon, Mature adult
Copper Dragon, Mature adult
Devil, Horned
Gold Dragon, Adult
Golem, Greater Stone
Green Dragon, Mature adult
Nightshade, Nightwalker
That's it. So remember when looking at these numbers, what you're seeing isn't necessarily representative of what players are going to be constantly fighting at these levels. There are no humanoid NPCs, several good-aligned monsters, and note that fully half of all the creatures are dragons, which will skew the average to dragon-like stats. I don't know about your game, but for mine, classed humanoids, with all the class abilities and buffs and such that come along with them, tend to be the single most common type of opponent at all levels. Evil outsiders, who come with their own set of resistances, immunities, buffs, etc., are easily #2 at these higher levels. For other games, maybe you're fighting flights of dragons all the time, and these numbers will be more helpful.