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As of August 2016, Jehovah's Witnesses report an average membership of approximately 8.13 million actively involved in preaching, with a peak of 8.34 million. Jehovah's Witnesses have an active presence in most countries, though they do not form a large part of the population of any country.
To be counted, an individual must be a publisher, and report some amount of time preaching to non-members, normally at least an hour per month. Under certain circumstances, such as chronic and debilitating illness, members may report increments of 15 minutes. Jehovah's Witnesses' preaching activity is self-reported, and members are directed to submit a 'Field Service Report' each month. Baptized members who fail to submit a report every month are termed 'irregular'. Those who do not submit a report for six continuous months are termed 'inactive'. In 2016, these reports indicated a total of more than 1.983 billion hours of preaching, and an increase of 264,535 baptized members. Over 10.15 million were also reported as studying the Bible in their homes with Jehovah's Witnesses, which includes Bible studies conducted by Witness parents with their children.
Jehovah's Witnesses' official statistics only count as members those who submit reports for preaching activity, usually resulting in lower membership numbers than those found by external surveys. For example, Jehovah's Witnesses report approximately 1.2 million active publishers in the United States (including some children), whereas the Pew Research Center reported that Jehovah's Witnesses make up 0.8% of the US population (approximately 2.5 million). Their official statistics indicate membership according to various territories—which they refer to as "lands"—many of which are not independent countries.
The number of people who attend Jehovah's Witnesses' annual commemoration of the Memorial of Christ's death (also termed the Lord's Evening Meal) includes active Witnesses, their children, and others who are invited to attend. According to the 2017 Yearbook of Jehovah's Witnesses, worldwide attendance at the 2016 celebration of the Memorial was 20,085,142. In the United States, 2.5 million people were present. In Zambia 890,840 attended, or 1 person for every 19 in the population. Of those attending worldwide, over 18,000 partook of the memorial emblems of unleavened bread and wine. Those who partake profess to be of the 144,000 "anointed" and hope to go to heaven, based on their interpretation of Revelation 14:1.
Congregations are generally organized geographically, and members are requested to attend the Kingdom Hall to which their neighborhood has been assigned, resulting in an ethnic mix generally representative of local population, though congregations based on language and ethnicity have also been formed. In the United States, 37% of adults who self-identify as Jehovah's Witnesses are African Americans. This is the highest proportion among the 22 largest religious identifications in the United States.