Population in the prairie provinces fell below natural replacement level.

This is where the concept of the replacement level enters the picture.

In fact, a 1992 survey found that the birth rate had fallen to replacement level.

The birth rate in industrialized countries is already slightly below replacement level.

The fertility rate, at 1.21, is below the replacement level.

The total fertility rate is 1.03, well below the replacement level.

This marks the second consecutive year in which the rate has been above replacement level.

Birth rates have now recovered somewhat, but they are not even close to replacement levels.

But population, over the entire country, was cut back to a smaller replacement level.

Whatever the cause, he said, "We are the only developed country today that is anywhere near replacement level, and nobody has an explanation for it."