In each of 20 recent and consecutive years, 10,000 people were randomly selected and the numbers of births they generated were found, with the results given below. How might the results be explained? (The listed values are based on data from the U.S. Department of Health and Human Services, and they are the most recent values available at the time of this writing.)

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157 160 164 167 167 162 158 154 150 146 144 142 143 142 144 141 139 141 140 140