It's the result of a large culmination of factors. For one, it's largely an incremental process. For example, someone didn't just build the first personal compu

It's the result of a large culmination of factors. For one, it's largely an incremental process. For example, someone didn't just build the first personal computer out of thin air. There was electricity, then transistors, then microchips, etc. all 'invented' by different people but each previously needed for the latter. Secondly, in order for incremental processes to happen, there needs to be large knowledge-sharing so that people know what's possible and can build on top of previous advancements. The 20th century brought rapid globalization, long-distance communication, and now the internet, which have all rapidly increased the dissemination of information. Lastly, the population has been steadily growing, and if you believe that the more people there are, the more inventions there will be, then it makes sense that they have increased over time.