-97.88% is the change from 989 to 21
Calculation steps:
[( 21 - 989 ) ÷ 989] x 100 = -97.88%
Formula
Percentage change = [(21 - 989) / 989] x 100
Subtract the new number by the original number
21 - 989 = -968
-968 ÷ 989 = -0.9787664307381193
-0.9787664307381193 x 100 = -97.88%