-91.73% is the change from 254 to 21
Calculation steps:
[( 21 - 254 ) ÷ 254] x 100 = -91.73%
Formula
Percentage change = [(21 - 254) / 254] x 100
Subtract the new number by the original number
21 - 254 = -233
-233 ÷ 254 = -0.9173228346456693
-0.9173228346456693 x 100 = -91.73%