its member municipalities during the prior fiscal year, multiplied by the sum of the following: one; plus the income growth factor set forth in subsection 3; plus the annual property growth factor for its member municipalities set forth in subsection 1.

B.__In the event the prior year's assessment reflects the effect of extraordinary, nonrecurring events, the county may submit a written notice to the State Tax Assessor requesting an adjustment in the assessment calculation.__The adjustment must be determined in a reasonable amount of time.

3.__Income growth factor.__The income growth factor applicable to fiscal years following the effective date of this section is the base growth factor, defined as the average real personal income growth rate, defined in Title 5, section 1665, subsection 1, which rate may not exceed 2.75%.__For fiscal years commencing after such time as the state tax burden ranks in the middle 1/3 of all states, as determined by the State Tax Assessor, the growth factor must become the personal income growth factor.__The personal income growth factor is one plus the average percent change in personal income in this State for the prior 10 calendar years, ending with the most recent calendar year for which data are available, as estimated by the United States Department of Commerce, Bureau of Economic Analysis.__For purposes of this section, "state tax burden" means the total amount of state and local taxes paid by Maine residents, per $1,000 of income, as determined by the State Tax Assessor based on data from the United States Department of Commerce, Bureau of Census and Bureau of Economic Analysis.__The State Tax Assessor shall undertake this calculation no less than once per year.__For any fiscal year thereafter, if the State Tax Assessor has determined that the state tax burden has increased to the highest 1/3 of states, the growth factor for the following fiscal year must be the base growth factor.__In all other fiscal years when the state tax burden ranks in the middle 1/3 of states, as determined by the State Tax Assessor, the growth factor must be the personal income growth factor.

4.__Adjustment for new state funding.__In addition to subsection 3, in the event the State provides net new funding to a county for existing services funded in whole or in part by assessments, other than required state mandate funds pursuant to section 5685 that do not displace current assessment-based expenditures, the county must lower its assessment limit in that year in an amount equal to the net new funds.__For purposes of this subsection, "net new funds" means the amount of funds