Ancient Debris statistics

While I know some wikis have Ancient Debris being more common at Y=15, I thought I'd study it myself a bit on a Vanilla SP world.
By replacing non-Ancient Debris blocks with air and looking at what Y value they were found at, I have some results.

So far, I've looked through 160 chunks, from Y=7 to Y=23, a total of 186 Ancient Debris blocks found. 27.5% chunks had no Ancient Debris blocks. The median number of Ancient Debris blocks per chunk was 1, with an average of 1.16 blocks.

Y value = #AD
23 = 1
22 = 5
21 = 6
20 = 12
19 = 8
18 = 9
17 = 13
16 = 14
15 = 24
14 = 30
13 = 24
12 = 19
11 = 6
10 = 2
9 = 6
8 = 6
7 = 1

The "sweet spot" would seem to be Y=12 to Y=17. These Y values accounted for 124 out of the 186 Ancient Debris blocks, or 66%. I did not examined the occurrence based on Nether Biomes.
I assume these occurrence rates would be the same on EMC.

Thank you for this!! this is awesome!

I hope this was a Mojang easter egg.

It was actually something like 1.1562 or so, I just rounded up.
I'm going see about tracking the biome type before I look at too many more chunks.