-97.87% is the change from 988 to 21
Calculation steps:
[( 21 - 988 ) ÷ 988] x 100 = -97.87%
Formula
Percentage change = [(21 - 988) / 988] x 100
Subtract the new number by the original number
21 - 988 = -967
-967 ÷ 988 = -0.978744939271255
-0.978744939271255 x 100 = -97.87%