Between 1951 and 2001, when the country's population increased by 185%, the number of Parsi-Zoroastrians fell by 37.7%. This probably explains why no other community in India watches its demographics as closely as the Parsi-Zoroastrians. While the country measures its demographic milestones in decennial censuses, the Parsis have an annual count that is keenly studied by community members who are worried about their declining numbers.

Mumbai-based magazine Parsiana carries a weekly update on the number of births, marriages and deaths in their worldwide Diaspora. In Mumbai, where the majority of the community lives, the information comes from the municipal corporations, marriage venues and hospitals. The statistics from outside the country is collected from community associations. The weekly lists are then compiled into an annual report.

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