I have compiled the grand totals of the world wide preaching work of Jehovah’s witnesses. The data comes from the official year book reports from 1991 to 2019, and older data comes from a table in the book “Jehovah’s Witnesses – proclaimers of God’s kingdom”. These stats only cover every 5th year from 1935 to 1985, so the intervening years have been estimated as a linear average between these years.
