-87.76% is the change from 678 to 83
Calculation steps:
[( 83 - 678 ) ÷ 678] x 100 = -87.76%
Formula
Percentage change = [(83 - 678) / 678] x 100
Subtract the new number by the original number
83 - 678 = -595
-595 ÷ 678 = -0.8775811209439528
-0.8775811209439528 x 100 = -87.76%