age cohort.
We begin by comparing the raw homicide rates attributed to each age group. Figure 1 shows the rate of homicides
attributed per 100,000 for these two age cohorts. [FN42] We set the rate for each group equal to 100 in 1980,
with the rate in each year thereafter represented as a percentage of the 1980 rate. This allows us to observe more accurately
comparative trends over time.