-35.4% is the change from 531 to 343
Calculation steps:
[( 343 - 531 ) ÷ 531] x 100 = -35.4%
Formula
Percentage change = [(343 - 531) / 531] x 100
Subtract the new number by the original number
343 - 531 = -188
-188 ÷ 531 = -0.3540489642184557
-0.3540489642184557 x 100 = -35.4%