It would be interesting to compare that "200" number to the count of congregations from the 2006 yearbook, vs. the 2005 yearbook.
If, for example, there was only an increase of 180 in the books, that would indicate 20 congregations dissolved (not a number the Society would like to push).
Even if there doesn't turn out to be such an obvious drop, the number itself is pretty meaningless.
Where I live, there is an enormous influx of people moving in, JWs included. There was a "new congregation" formed here last year, and another likely to follow this year. But that is due to JWs moving in from other states. So you have 2 "new congregations", but 20 congregations from up north are now smaller.