-93.29% is the change from 313 to 21
Calculation steps:
[( 21 - 313 ) ÷ 313] x 100 = -93.29%
Formula
Percentage change = [(21 - 313) / 313] x 100
Subtract the new number by the original number
21 - 313 = -292
-292 ÷ 313 = -0.9329073482428115
-0.9329073482428115 x 100 = -93.29%