Fix the grammatical mistakes: Thus this refers to an increase in the population's mean age which is generally due to the decline in birth rate and the increase life expectancy.
The population is growing at a rate of 1.5% per year.
The population is growing at a rate of 1.5% per year.
The population is growing at a rate of 1.5% per year.
The population is growing at a rate of 1.5% per year.
The population is growing at a rate of 1.5% per year.
The population is growing at a rate of 1.5% per year
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