471 million potatos is a lot of potatos.
.2mm bits of plastic is enough to cover in plastic all of the living rooms in California.
Wait - no - one living room. Or about a dinner-plates worth a day.
Every day. That's the difference.
Even assuming that it's a dinner plate sized amount of pollution, over two decades, you are looking at 7300 dinner plates. Only, broken into little chunks, easily consumed by aquatic life and smothering plants, clogging pipes etc.