-91.16% is the change from 645 to 57
Calculation steps:
[( 57 - 645 ) ÷ 645] x 100 = -91.16%
Formula
Percentage change = [(57 - 645) / 645] x 100
Subtract the new number by the original number
57 - 645 = -588
-588 ÷ 645 = -0.9116279069767442
-0.9116279069767442 x 100 = -91.16%