-97.77% is the change from 942 to 21
Calculation steps:
[( 21 - 942 ) ÷ 942] x 100 = -97.77%
Formula
Percentage change = [(21 - 942) / 942] x 100
Subtract the new number by the original number
21 - 942 = -921
-921 ÷ 942 = -0.9777070063694268
-0.9777070063694268 x 100 = -97.77%