In what year did Jem chop off the tops of Mrs. Dubose's camellia bushes?

It was in the year 1934 that Jem got angry at old Mrs. Dubose and chopped off the tops of her treasured camellia bushes. We know this because it happened the year before Tom Robinson's trial, which took place in 1935.

One day, Mrs. Dubose, an older lady who lived down the street from the Finch house, insulted Atticus because of his defense of Tom Robinson. This made Jem so angry that he "was scarlet." Jem wanted to get back at her. He took Scout's baton and ran back to Mrs. Dubose's house. He held the baton and used it like a sword, hacking at the camellia bushes until the tops of all of them were gone and "the ground was littered with green buds and leaves." He was so angry even after he had chopped up the camellia bushes that he snapped Scout's baton in half.