-60.57% is the change from 870 to 343
Calculation steps:
[( 343 - 870 ) ÷ 870] x 100 = -60.57%
Formula
Percentage change = [(343 - 870) / 870] x 100
Subtract the new number by the original number
343 - 870 = -527
-527 ÷ 870 = -0.6057471264367816
-0.6057471264367816 x 100 = -60.57%