In 1969 the JWs worldwide were about 1,156,802 (based on reverse amortization). ... In 2002 the JWs worldwide are about 6,093,207 (based on forward amortization). This represents about a 5.05% average growth over the last 33 years.
Had no one died or been DF’d/DA’d in the last 33 years, the growth rate would have been closer to an average of 7.05% resulting in a population of JWs around the world of 11,767,623.
The “natural” death rate (excluding wars or sever abject conditions) has held to about 1% worldwide for the last 100+ years (used in industry actuarial tables). The DF/DA rate has also held at about 1% during the last 33+ years. However, the net amount of 6,093,207 JWs I use already reflects these changes for loss due to death and DF/DA and any reinstatements. Therefore:
The baptism rate has averaged about 6.6% during most of the last 33 years, some years higher and some lower, especially in recent years. The "Delta change" between baptisms of 6.6% and the net gain of 5.05% average growth, means that there was a loss of 1.55% per year average due to people walking away, (not including those remaining DF’d or DA’d thus, not seeking reinstatement). This means that over a 33 year period, from 1969 to 2002, approximately 1,775,106 have left the organization and are still alive, but were not DF or DA.
These numbers are based on average percentages, average baptisms, and average publishers I have noted from JW yearbooks, etc. and using these to recalculate annual averages and amortizations. Were someone to go back and add together all the “actual baptisms” and then subtract the net number of "actual" JWs on hand today, and factor in the death rate for those baptized, they may have a slightly to moderately different result.