How to calculate the annual patent income?

The patent year is calculated from the date of application, and the annual fee is generally increasing year by year. According to the new patent payment policy in 2023. The third year 1 0,900 (annually), the fourth and sixth years 1200 (annually). Seventh and ninth years (every year) 2000. Year 10~ 12 (every year) 4000. 13~ 15 (per year) 6000, 16~20 (per year) 8000.