DJ DJ-BTM Business Barometer -2: Smoothed Index Down 0.1% . NEW YORK (Dow Jones)--The Dow Jones-Bank of Tokyo-Mitsubishi weekly business barometer decreased by 0.3% in the week ended Sept. 6, continuing a saw-tooth pattern seen over the last few weeks. A week earlier, the barometer posted a 0.9% increase, which followed a 0.6% decrease the week before that. A statistically smoothed version of the index declined by 0.1% in the latest week and is up only 0.1 percentage point from its level in the week ended June 28. "It is not clear whether the early September weakness was associated with...