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By Zombie Pumpkins!
#99560
To search by year, you can type any year (from "2002" to "2018") into the main search form:

https://www.zombiepumpkins.com/search

This will show you all the patterns released for that year. For example, here's 2015.

Once you're on a year's page, you can then click the small arrows on the right and left of the title, to view to the next and previous year.

Also, when you're viewing an individual pattern's page (for example, Princess Leia) you'll see details for the pattern like: Category, Year, and Difficulty. Clicking any of those will take you to a page with patterns of that same Category, Year or Difficulty.