Animation historian Jerry Beck had posted on Cartoon Research lists of animated shorts from various studios considered for nomination of the Academy Award for Best Animated Short Film, beginning with 1948 and ending for the time being with 1986.
According to Jerry, each film submitted to the Academy fall into one or more of these categories: “Craft”, “Heart” or “Humor”.
Missing gaps on that site are 1949, 1950, 1976, 1981, 1982 and 1985.
Note: ± means the film was nominated for the award.