-97.71% is the change from 918 to 21
Calculation steps:
[( 21 - 918 ) ÷ 918] x 100 = -97.71%
Formula
Percentage change = [(21 - 918) / 918] x 100
Subtract the new number by the original number
21 - 918 = -897
-897 ÷ 918 = -0.9771241830065359
-0.9771241830065359 x 100 = -97.71%