Tenn. Code § 8-14-110
For the twentieth and thirtieth judicial districts, the state shall pay, in equal quarterly installments, to the county or metropolitan government which has a local public defender, an amount annually appropriated for that purpose. Such amount shall not be less than the amount appropriated in fiscal year 1992-1993. In addition to the amount appropriated in 1992-1993 the base level of state support on July 1, 2013, shall be adjusted to reflect the percent of change in the average consumer price index (all items-city average) as published by the United States department of labor, bureau of labor statistics, between that figure for the calendar year 2011 and the calendar year 2012. Each succeeding July 1, a similar adjustment shall be made, based on the percent of change in the average consumer price index between the two (2) calendar years preceding July 1 of the year in which the adjustment is made. The adjustment provided for in this section must not exceed the greater of five percent (5%)per annum or the percentage increase provided for the state public defender and district attorney general offices during the fiscal year for which the adjustment was made.
T.C.A. § 8-14-110