The reasons for the putative decrease in recycling rate include the increase in plastic production, flat change in recycling capacity, and China no longer accepting our recyclables. A Time magazine article further suggests that the estimated 9% recycling rate from 2018 was inflated because most of the plastic we sent to China was landfilled or incinerated. Another interesting point: an estimated 30-36% of collected PET is wasted in the recycling process.

The original report can be accessed here: https://bit.ly/US-plastics-recycling-rate . Table 2 provides estimates and sources.