-97.75% is the change from 935 to 21
Calculation steps:
[( 21 - 935 ) ÷ 935] x 100 = -97.75%
Formula
Percentage change = [(21 - 935) / 935] x 100
Subtract the new number by the original number
21 - 935 = -914
-914 ÷ 935 = -0.9775401069518717
-0.9775401069518717 x 100 = -97.75%