-92.61% is the change from 284 to 21
Calculation steps:
[( 21 - 284 ) ÷ 284] x 100 = -92.61%
Formula
Percentage change = [(21 - 284) / 284] x 100
Subtract the new number by the original number
21 - 284 = -263
-263 ÷ 284 = -0.926056338028169
-0.926056338028169 x 100 = -92.61%