-93.27% is the change from 312 to 21
Calculation steps:
[( 21 - 312 ) ÷ 312] x 100 = -93.27%
Formula
Percentage change = [(21 - 312) / 312] x 100
Subtract the new number by the original number
21 - 312 = -291
-291 ÷ 312 = -0.9326923076923077
-0.9326923076923077 x 100 = -93.27%