-97.54% is the change from 853 to 21
Calculation steps:
[( 21 - 853 ) ÷ 853] x 100 = -97.54%
Formula
Percentage change = [(21 - 853) / 853] x 100
Subtract the new number by the original number
21 - 853 = -832
-832 ÷ 853 = -0.9753810082063306
-0.9753810082063306 x 100 = -97.54%