-92.31% is the change from 637 to 49
Calculation steps:
[( 49 - 637 ) ÷ 637] x 100 = -92.31%
Formula
Percentage change = [(49 - 637) / 637] x 100
Subtract the new number by the original number
49 - 637 = -588
-588 ÷ 637 = -0.9230769230769231
-0.9230769230769231 x 100 = -92.31%