user: Question: What is the per capital income for Charles county?
Columns: ['County', 'Per capita income', 'Median household income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Howard', '$46,594', '$105,692', 299430.0, 103547.0]
SQL:

assistant: SELECT "Per capita income" FROM "Table" WHERE "County" = 'Charles';