Returns a data frame with the following columns:
region
The region identifier.
name
The name of that region.
level
The census aggregation level of that region.
pop
The population of that region.
municipal_status
Additional identifiers to distinguish the
municipal status of census subdivisions.
CMA_UID
The identifier for the Census Metropolitan Area the region is in (if any).
CD_UID
The identifier for the Census District the region is in (if any).
PR_UID
The identifier for the Province the region is in (if unique).