Your question is essentially unknowable, as the definition of invention is unclear, and we have no hope of estimating quantity with anything like the precision

Your question is essentially unknowable, as the definition of invention is unclear, and we have no hope of estimating quantity with anything like the precision we have with modern recordkeeping (we can't estimate how many patents would have been produced in the 10th century had the modern patent system existed back then). Recall that there's a lot of innovation in the "little things"; note that a parallel post is talking about different shapes of spearheads, and each of those variations would definitely correspond to a new patent in the modern patent system. At the same time, most written sources throughout history are from elites, who give very little thought to what the working classes are doing, and thus tend to ignore innovation that does exist. My gut instinct is that innovation rate throughout history is largely constant on a per-capita basis, although I would admit that probably some industries are more or less innovative at various stages or in history. Through that lens, the fact that you're looking at >10× total person-years pre-1800 compared to post-2000 means that I'd feel rather comfortable opining that there were more total innovations before 1800 than after 2000.