Here is one, from the Freeminds site.
How many members are lost each year?
No direct figures are available for this. However, calculate the increase between 1992 and 1994 and compare to the number baptized.
1994 Average Publishers (4,695,111) less
1993 Average Publishers (4,483,900) equals
211,211. Yet 314,818 were baptized, a loss of 101,841.
Or, compare:
1993 Average Publishers (4,483,900) with 1992 Average Publishers (4,289,737) equals
194,163. Yet 296,004 were baptized, a loss of 103,607.
Compared to the baptism figures, there are missing numbers of 101,841 and 103,607, respectively. This figure encompasses the deceased, the inactive, disfellowshipped, and disassociated. (A 1% mortality rate may be expected, but a JW who has investigated this has suggested that 0.5% is more likely given the demographic profile of membership.) It is also inflated by those who were baptized in 1994 but were already active preachers in 1993, but this is more than compensated by the larger number who are preachers in 1994 but not yet baptized, i.e. still students (usually so for a few months) or unbaptized children (perhaps for 10 years or more). As with all these figures, the picture varies greatly across the world.