I don't even know if you can tell that. It could just be the people that are already here are reproducing.
This says 51,283 people were born in Oklahoma in 2004 alone.
Births, Birth Rates, and Fertility Rates by State, 2004 — Infoplease.com
That's about a third of the population increase of 166,662 over 6 years in just one year. If we were to accept 51,283 as an average year for births over those 6 years (there's no real good reason to do this, but it's the only data I have), that would be 307,698 births in those six years. That would mean that, net of births, there was actually a population
decrease of 141,036. And, obviously, people are coming into the state in ways other than the delivery room, so that means that even more people actually left (births + migration into state - people leaving = 166,662).
I don't know what number constitutes a drove, but it would be safe to say that a number of people at least the size of the overall population increase migrated out of the state during that period. Another way to look at it would be if people were moving into the state at the exact same rate as they were leaving, we should have seen a population increase of around 300,000, not 166,000, just from the births.
In contrast, and using the same (possibly specious) method, Texas had a population growth of 3,052,560 over that same time period. Extrapolating from the 2004 birth figures, they had an estimated 2,306,334 births in that time period. That means they had a population
increase of 746,226 over those 6 years, net of births.
So, without having birthrates for each year, it's still impossible to tell the migration rates for the state just by looking at population estimates. However, it's pretty safe to say that the numbers don't really dispute the claim that people are leaving in "droves". More likely, the numbers actually prove that claim out. Of course, that really all depends on the agreed upon measure of a drove would be.
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