Fix grammar in the sentence: This is because the problem of an aging population affects the rate of development of a country on a long run.
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The population of, which is the population of, is growing at a rate of 1.5% per year.
The population of, which is the population of, is growing at a rate of 1.5% per year.
The population of, which is the population of, is growing at a rate of 1.5% per year.
The population of, which is the population of, is growing at a rate of