War and Social Upheaval Cause Spikes in Zombie Movie Production

I’d like to see a set of charts that correct for the number of movies released that year, or even the number of horror movies released per year. It’d also be interesting to know how the release of horror movies in general correlate to social trends. Torture movies (Texas Chainsaw Massacre, Saw) coincides well with Vietnam and Iraq, for example, times when Americans felt helpless in a violent world that traditional military solutions couldn’t solve.