The changes made to this subsection (d) by this amendatory Act of the 91st General Assembly apply to all initial increases that become payable under this subsection on or after January 1, 1999. All initial increases that became payable under this subsection on or after January 1, 1999 and before the effective date of this amendatory Act shall be recalculated and the additional amount accruing for that period, if any, shall be payable to the pensioner in a lump sum.
For the purposes of this subsection (g), "consumer price index-u" means the index published by the Bureau of Labor Statistics of the United States Department of Labor that measures the average change in prices of goods and services purchased by all urban consumers, United States city average, all items, 1982-84 = 100. The new amount resulting from each annual adjustment shall be determined by the Public Pension Division of the Department of Insurance and made available to the boards of the pension funds.
40 ILCS 5/4-109.1