How to calculate the year-on-year growth rate of recruitment

Year-on-year growth rate of recruitment = (number of people in this period-number of people in the same period)/number of people in the same period. Year-on-year is the comparison between the nth month of this year and the nth month of last year. The year-on-year development speed is mainly to eliminate the influence of seasonal changes, and to illustrate the relative development speed by comparing the development level of this period with that of the same period last year.