-79.22% is the change from 438 to 91
Calculation steps:
[( 91 - 438 ) ÷ 438] x 100 = -79.22%
Formula
Percentage change = [(91 - 438) / 438] x 100
Subtract the new number by the original number
91 - 438 = -347
-347 ÷ 438 = -0.7922374429223744
-0.7922374429223744 x 100 = -79.22%