In 2020 and 2021, approximately 122,000 and 150,000 family-based immigrant visas, respectively, went unused.
FY 2023, approximately 197,000 total employment-based visas were available, thanks to the rollover of an additional 57,000 unused family-sponsored visa numbers from FY 2022. The good news is that there won't be any rollover visas from the family-based preference from 2023 for 2024.
Over the course of three years, a total of 329,000 visas went unused. Typically, the family preference category receives 226,000 visas per fiscal year, which means that approximately 1.5 years' worth of visas were wasted.