-49.7% is the change from 676 to 340
Calculation steps:
[( 340 - 676 ) ÷ 676] x 100 = -49.7%
Formula
Percentage change = [(340 - 676) / 676] x 100
Subtract the new number by the original number
340 - 676 = -336
-336 ÷ 676 = -0.4970414201183432
-0.4970414201183432 x 100 = -49.7%