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

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'