Volume of job listings on one site over the last 30 months would be measuring far more than the trend in number of jobs. Did the job site add new features? Did

Volume of job listings on one site over the last 30 months would be measuring far more than the trend in number of jobs. Did the job site add new features? Did they snag a big new customer who consistently posts their jobs there? Did they run a different ad campaign, or more of them? If the company is doing well, it'll probably have a steadily increasing number of job listings over that period, but it doesn't necessarily mean that there are more jobs available overall.