Very good information above; and in all honesty, with varying sizes of different rodent populations everywhere in urban & rural areas, lots depends "where" one lives & also what our neighbors have & do not have as far as cats, etc.
Rodent Control professionals claim rodent "food" supply is "directly" related to rodent "reproduction"; and drastically reducing rodent food supply always means fewer rodents; but we have no control over our neighbor's source of rodent food supply & our neighbor's rodent population.
Have no idea, but it appears that declaring war & preventing a second new expensive Model A, LB interior, (or other interior), from being eaten up by rodents and/or moths, (especially, for a "second" time), gets to be far more aggressive & serious business than it was the first time.