-91.58% is the change from 641 to 54
Calculation steps:
[( 54 - 641 ) ÷ 641] x 100 = -91.58%
Formula
Percentage change = [(54 - 641) / 641] x 100
Subtract the new number by the original number
54 - 641 = -587
-587 ÷ 641 = -0.9157566302652106
-0.9157566302652106 x 100 = -91.58%