> There may not be many oversized op returns to begin with

In total, there are about 10**4 op_returns on the blockchain of size 76 bytes

For 77 byte op_returns, the count is also ~10**4 (i.e. ~10k)

For 78 byte op_returns, the count is also ~10**4 (i.e. ~10k)

For 79 byte op_returns, the count is also ~10**4 (i.e. ~10k)

For 80 byte op_returns, the count is slightly higher: ~10**4.1 (i.e. ~13k)

For 81 byte op_returns, the total count is 9. Not 9k, *9 in total.*

That's the data for the last 16 years, which I hope is a long enough time frame for you.

Why do you suppose there is a huge drop from tens of thousands to 9?