CREATE TABLE table_15341 ("Client" TEXT, "Years of Operation" TEXT, "Area of Operation" TEXT, "Country" TEXT, "Services" TEXT)

What years was El Mabrouk the area of operation?
SELECT "Years of Operation" FROM table_15341 WHERE "Area of Operation" = 'el mabrouk'
SELECT "Years of Operation" FROM "table_15341" WHERE "Area of Operation" = 'el mabrouk'