Table:
text: List of Appalachian Regional Commission counties
Alabama
Alabama
County Population Unemployment_Rate Market_Income_Per_Capita Poverty_Rate Status_
Tallapoosa 41010 5.2% $20,518 16.6% Transitional
Tuscaloosa 171159 3.3% $28,044 17.0% Transitional
Walker 70034 4.3% $21,039 16.5% Transitional

Question: What is the poverty rate for a county with a per capita market income of $20,518 in Alabama under the Appalachian Regional Commission counties list?