Okay, I had to post this, as I found it to be … weirdly fascinating. Google has a tool that allows you to search for terms and see how they have trended over time based on global search volume. The service is called Google Trends, check it out.
Here is the result for the term “epistemology”:
Apparently interest for the term “epistemology” follows a strong yearly cycle, with two maximum values in October and Feb/March and one strong minimum in July. Interestingly, the same basic pattern applies to the closely related term “ontology” (“close” if you are in philosophy, that is):