I was looking at the info on jwic.com and realized the following about the US "publishers" numbers:
Between 1994 and 2004 the number of US publishers rose from about 900,000 to about 1,000,000. That's about 11% over those ten years, or about 1% compounded annually (well below the population growth rate).
In addition, between 1994 and 2004 about 392,000 people were baptised. That means the attrition rate between those baptised and those who stay is about 75% over the ten year period .
Does anyone have the actual publishers numbers for the last ten years for the US? The jwic site only has the graphs and no exact numbers.