-63.16% is the change from 866 to 319
Calculation steps:
[( 319 - 866 ) ÷ 866] x 100 = -63.16%
Formula
Percentage change = [(319 - 866) / 866] x 100
Subtract the new number by the original number
319 - 866 = -547
-547 ÷ 866 = -0.6316397228637414
-0.6316397228637414 x 100 = -63.16%