How do you know how many Jehovah's Witnesses are actively witnessing?

[The Librarian]

Each month, Witnesses report their preaching activity to their local congregation. This report is made voluntarily.

Congregation reports are tabulated, and the totals are sent to the local branch office. The branch sends the totals for each country or territory to our world headquarters.

At the end of every service year, * the peak number of Witnesses for each land during that year is determined. These figures are added together to determine the number of Witnesses worldwide. Detailed reports for each country, including experiences from the preaching work, are published in the Yearbook of Jehovah’s Witnesses. These reports encourage us, just as similar reports encouraged the early Christians.—Acts 2:41; 4:4; 15:3.