-86.75% is the change from 921 to 122
Calculation steps:
[( 122 - 921 ) ÷ 921] x 100 = -86.75%
Formula
Percentage change = [(122 - 921) / 921] x 100
Subtract the new number by the original number
122 - 921 = -799
-799 ÷ 921 = -0.8675352877307275
-0.8675352877307275 x 100 = -86.75%