user: Question: when is the latest to join prsl when founded in 2007 and the stadium is Roberto Clemente Stadium 1?
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 MAX("Joined PRSL") FROM "Table" WHERE "Founded" = 2007.0 AND "Stadium" = 'Roberto Clemente Stadium 1';