Hi everyone.
I did a little number crunching with these interesting figures. Using the formula that was given earlier of total number of baptized over the last 20 years (1985-2005) added to the peak number of 1985 publishers yields the following:
6,160,944 (baptized over 20 years) + 3,024,131 (1985 peak publishers) = 9,185,075
To keep calculations easy, I assumed no loss from this number over 20 years. So, there should be 9.18 million witnesses out there today. But there aren't.
Using 2005 peak publishers number, there are only 6,613,829. That's a difference of 2,571,246 (9,185,075 minus 6,613,829), as the chart shows.
I think the percentage loss is calculated by dividing the 2.57 million of the "missing" by 9.18 million who should be the total but for the losses. The number is very close to 28% loss. A high number, but not 41%.