Levels of consciousness according to consciousness research.

Stages of Development according to Spiral Dynamics. (Leading Edge of Consciousness development, the spiritual avant-garde.)

About 5% of individuals are estimated to be in Second Tier overall (i.e. beyond “integral/Teal” or equivalent).

Of that 5%, those at the upper reaches (very high vision-logic, transpersonal etc.) are much fewer — perhaps 0.5% or less of the population.

So depending how you define “post-integral indigo,” if by that you mean “very advanced second-tier consciousness,” you’re likely talking about less than 1% of people.