-93.41% is the change from 637 to 42
Calculation steps:
[( 42 - 637 ) ÷ 637] x 100 = -93.41%
Formula
Percentage change = [(42 - 637) / 637] x 100
Subtract the new number by the original number
42 - 637 = -595
-595 ÷ 637 = -0.9340659340659341
-0.9340659340659341 x 100 = -93.41%