-87.56% is the change from 667 to 83
Calculation steps:
[( 83 - 667 ) ÷ 667] x 100 = -87.56%
Formula
Percentage change = [(83 - 667) / 667] x 100
Subtract the new number by the original number
83 - 667 = -584
-584 ÷ 667 = -0.8755622188905547
-0.8755622188905547 x 100 = -87.56%