What should be the high and low standards for birth and death rates in population reproduction?

The birth rates of the original and traditional types are both above 3%, but the mortality rate and natural growth rate of the traditional type are relatively low; the death rates of the transitional and modern types are roughly around 1%, but the birth rate of the modern type is roughly 1.5

Less than %; the difference between the traditional type and the transitional type is that the mortality rate of the traditional type is generally close to 2%, while the mortality rate of the transitional type is generally less than 1%.