How to calculate the schedule of American EB3 immigrants?

The schedule of eb3 immigrants in the United States is irregular and supervised by the US Immigration Bureau. At the beginning of each fiscal year, scheduling will make great progress, and at the end of the fiscal year, scheduling will fall back. It is estimated that it will take 5-8 years for the United States to process eb3 immigrants. The above is arranged by Cai Ying abroad.