the three keywords

This is a graph of some of the three words that I consider most important on the subject of this blog, these are, terror, death and exorcism. The graph shows the search % of words in Google.

In the following link you can enter the full graphic:
https://books.google.com/ngrams/graph?content=terror%2C+dead%2C+exorcism&year_
start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cter
ror%3B%2Cc0%3B.t1%3B%2Cdead%3B%2Cc0%3B.t1%3B%2Cexorcism%3B%2Cc0