Years w/ Multiple Movies w/ a Common Theme

I was just thinking about this recently. Sometimes there is a year in which several very similar movies (or at least fairly similar movies) come out. There could be more than one reason why this happens, of course. Maybe a screenwriter is describing his idea for a movie to his girlfriend at a Hollywood restaurant, and is overheard by someone working for a rival studio. Or, maybe there was a big story in the news the year before, which started a sort of craze to make movies related to whatever the news story was. Or... there could be all kinds of reasons. I started a little list of years that have some kind of theme featured in at least two movies. If anybody can think of any other years with something similar going on, please post them here in the comments.

1979 -- Figures from British Literature of the 1890s Come to Modern America: Love at First Bite, and Time After Time
1981 -- Lycanthropy as a Lifestyle: American Werewolf in London, The Howling, and (sort of) Wolfen
1984 -- If You Die in Your Dreams, You Die in Real Life: Dreamscape and NoES
1987 -- Cool, Badass Modern Vampires with Attitude: Near Dark and The Lost Boys
1998 -- An Asteroid Threatens the Earth: Deep Impact and Armageddon

What are some other good ones? I know you guys can come up with some. It is debatable whether we should count SyFy movie trends... there was probably a year or two with multiple Sharknado movies, or years with multiple types of mutant giant spiders.... anyway, anyone have any other years with themes?