U.S. code dictates a rather complex equation for military pay raises, based on the Employment Cost Index, a measure compiled by the Bureau of Labor Statistics to track the costs of labor for businesses. Military pay increases by "the percentage (rounded to the nearest one-tenth of one percent) by which the ECI for the base quarter of the year before the preceding year exceeds the ECI for the base quarter of the second year before the preceding calendar year (if at all)". Specifically, the code states that the ECI for wages and salaries of private industry workers will be used.