-95.19% is the change from 312 to 15
Calculation steps:
[( 15 - 312 ) ÷ 312] x 100 = -95.19%
Formula
Percentage change = [(15 - 312) / 312] x 100
Subtract the new number by the original number
15 - 312 = -297
-297 ÷ 312 = -0.9519230769230769
-0.9519230769230769 x 100 = -95.19%