-89.06% is the change from 192 to 21
Calculation steps:
[( 21 - 192 ) ÷ 192] x 100 = -89.06%
Formula
Percentage change = [(21 - 192) / 192] x 100
Subtract the new number by the original number
21 - 192 = -171
-171 ÷ 192 = -0.890625
-0.890625 x 100 = -89.06%