Caption: Growth of known number of NEAs and NEA-KMs (i.e., large NEAs) 1980 Jan01--2021 Jul05.
For updates, click the NASA: Center for Near Earth Object Studies (CNEOS): Discovery Statistics. See accumulation table and graph at the link. The graph can be expanded to full screen in the upper right corner.
Features:
Variations in the definition of NEA-KMs may cause different references to give different values.
This means that there are still many NEAs and NEA-140m's to discover. We are NOT beginning to exhaust the statistical population of these astro-bodies.
In fact, there is no end to the number of NEAs since one can keep looking for smaller and smaller ones. But those that are less than ∼ 1 m in size scale (which are are better called meteoroids) usually pose a relatively small threat. See Wikipedia: NEO: Impact rate and Wikipedia: Impact event: Air bursts.
This means that we are nearly exhausting the NEA-KM statistical population.
Probably finding the very last NEA-KMs will take a long time since it takes an exhaustive search to find the very last ones.