ocr: The Vatican has about 1,000 permanent inhabitants, including several hundredi lay persons, and employs a further 3,400 lay staff. Citizenship can be acquired through stable residence andl - holding an office orjob within the City. A citizen's family can gain residence only by authorization. The Popeis spiritual head of almost 18% ofthe world's population. The countries with the largest number of Roman Catholics are Brazil, Mexico, Italy, the USA and the Philippines.
