(a) On October 1 of each year, the Secretary will increase the aggregate amounts of assistance available for grants authorized under 38 U.S.C. 2101(a) and 2101(b). Such increase will be equal to the percentage by which the Turner Building Cost Index for the most recent calendar year exceeds that of the next preceding calendar year.

(b) Notwithstanding paragraph (a) of this section, if the Turner Building Cost Index for the most recent full calendar year is equal to or less than the next preceding calendar year, the percentage increase will be zero.

(c) No later than September 30 of each year, the Secretary will publish in the Federal Register the aggregate amounts of assistance available for the upcoming fiscal year.