waiting:
the (simple) formula one uses is:
new inactives = (new baptisms for service year 2)- ((average from service year 2) - (average from service year 1))
from the 2001 service year report:
new inactives = new baptised for 2001 - (ave pub 2001 - ave pub 2000)
new inactives = (263,431) - (5,881,776 - 5,783,003)
new inactives = (263,431) - (98,773)
new inactives = 164,458
so, we see for 2001 about 3,000 a week leave the organization.
so 3,000 / 5,000 is about 60%, for 2001 at least.
actually if you look at the graph jayhawk provided, we can see that this 60% seems to hold for the years since 1995. Since 1995, almost 2.5 million have been baptised, but the number of publishers has increased by only 1 million.
This means 1.5 million have left since 1995, or 60% the number baptised.
Anyone care to venture a guess what happened in 1995? (hint: talking 'bout my generation)