fall-off 
(also falling-off)
noun (plural fall-offs or fallings-off)
A decrease in something: a fall-off in work caused by the recession...
- The company said weak market sentiment accounted for the drop in software sales while the decrease in services was due to a fall-off in customer numbers.
- New research has shown that shipments of PDAs and handheld devices are continuing to drop, with the fall-off blamed on the weak global economy.
- The Government's take from the tobacco industry is set to drop by at least €70m because of the fall-off in sales.
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