You’re the one trying to use this data to prove that the gun confiscation had an effect on homicides. If now you’re saying that there was no statistically significant change in homicide rates five years after the government destroyed over 600,000 guns, then you’re severely undermining your point.

The gun buyback isn’t something you’d expect to have a delayed impact on homicides. Certain weapons were banned, they were confiscated, and the program was over by 1997. Those guns could not be used to kill people. The number of guns started to go back up right after, as well.