CREATE TABLE table_204_10 (id DECIMAL, "ecclesiastical jurisdictions" TEXT, "latin name" TEXT, "type" TEXT, "rite" TEXT, "ecclesiastical province" TEXT, "established" TEXT, "area  ( km2 ) " DECIMAL)

how long has the barahona diocese been established ?
SELECT present_ref - "established" FROM table_204_10 WHERE "ecclesiastical jurisdictions" = 'barahona'
SELECT "present_ref" - "established" FROM "table_204_10" WHERE "ecclesiastical jurisdictions" = 'barahona'