The correct answer is: The statistics provide something to measure current data against to establish a pattern.
This answer is correct because it emphasizes that the statistics from 1999 serve as a benchmark to compare against current data. By showing that the percentage of women in leadership roles has barely increased over a span of more than two decades, it highlights a troubling pattern of stagnation in gender representation within the journalism industry. This reinforces the idea that there is a persistent gender problem that has not substantially improved over time.