-87.05% is the change from 641 to 83
Calculation steps:
[( 83 - 641 ) ÷ 641] x 100 = -87.05%
Formula
Percentage change = [(83 - 641) / 641] x 100
Subtract the new number by the original number
83 - 641 = -558
-558 ÷ 641 = -0.8705148205928237
-0.8705148205928237 x 100 = -87.05%