The figure for the amount spent on "special pioneers, missionaries and travelling overseers" goes back to 1985. But for such a long period of time inflation becomes an important factor. Does anyone know how to correct such a graph for US$ inflation over the relevant period?
In 1985, when there was a total of 3,024,131 publishers and 49,716 congregations, they spent a total of $20,827,314.57 on "special pioneers, missionaries and travelling overseers".
In 2015, when there was a total of 8,220,105 publishers and 118,016 congregation, they spent "over $236 million in caring for special pioneers, missionaries and travelling overseers".
So over that period publishers increased 172%, congregations increased 137% and the amount spent increased 1034%
That's up from spending $418 per congregation to spending $2000 per congregation.
An online inflation calculator says that $418 in 1985 is equivalent to $920 in 2015. So Watch Tower spend on "special pioneers, missionaries and travelling overseers" has increased 117% per congregation in real terms taking inflation into account.