user: Question: what is the earliest founded when the home city is Mayagüez?
Columns: ['Club', 'Home city', 'Stadium', 'Founded', 'Joined PRSL']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['FC Leones de Ponce', 'Ponce', 'Francisco "Paquito" Montaner Stadium', 2011.0, 2011.0]
SQL:

assistant: SELECT MIN("Founded") FROM "Table" WHERE "Home city" = 'Mayagüez';