15. (5 points) The following table indicates the annual volume you have experienced for the last several fiscal years and, as well, the first 6 months of the current fiscal year (year 6). Based on this information, how many units of service would you plan for in the coming budget year (year 7)? Fiscal Year Volume 1 4,600 2 4,800 3 5,000 4 5,200 5 5,400 6 2,800