Headed by patriarchs, metropolitans, and major archbishops, the Eastern Catholic Churches are governed in accordance with the Code of Canons of the Eastern Churches, although each church also has its own canons and laws on top of this, and the preservation of their own traditions is explicitly encouraged. The total membership of the various churches accounts for about 18 million, according to the "Annuario Pontificio" (the annual directory of the Catholic Church), thus making up about 1.5 percent of the Catholic Church, with the rest of its more than 1.3 billion members belonging to the Latin Church.