What was the population of the passenger pigeon all of the years until it became extinct?

The passenger pigeon once numbered in the billions in the early 19th century, with estimates suggesting a population of 3 to 5 billion. However, by the late 1800s, due to intense hunting and habitat loss, their numbers plummeted dramatically. By 1914, the last known passenger pigeon, named Martha, died in captivity, marking the species' extinction. The population declined from immense numbers to effectively zero in just a few decades.