-63.63% is the change from 866 to 315
Calculation steps:
[( 315 - 866 ) ÷ 866] x 100 = -63.63%
Formula
Percentage change = [(315 - 866) / 866] x 100
Subtract the new number by the original number
315 - 866 = -551
-551 ÷ 866 = -0.6362586605080831
-0.6362586605080831 x 100 = -63.63%