-93.25% is the change from 311 to 21
Calculation steps:
[( 21 - 311 ) ÷ 311] x 100 = -93.25%
Formula
Percentage change = [(21 - 311) / 311] x 100
Subtract the new number by the original number
21 - 311 = -290
-290 ÷ 311 = -0.932475884244373
-0.932475884244373 x 100 = -93.25%