-83.89% is the change from 391 to 63
Calculation steps:
[( 63 - 391 ) ÷ 391] x 100 = -83.89%
Formula
Percentage change = [(63 - 391) / 391] x 100
Subtract the new number by the original number
63 - 391 = -328
-328 ÷ 391 = -0.8388746803069054
-0.8388746803069054 x 100 = -83.89%