Problem description
API is called population density data, however it exposes population count, not denisty:
"
populationData:
dataType: DENSITY_ESTIMATION
maxPopulation: 150
minPopulation: 30
avgPopulation: 60"
Moreover dataType is "DENSITY_ESTIMATION" while the exposed data is not a density - this is misleading.

Expected behavior
Api name, data types, attributes names must match like:
PopulationDensityData:
dataType: PPL_DENSITY_ESTIMATION
max: 150
min: 30
avg: 60"