-40.76% is the change from 866 to 513
Calculation steps:
[( 513 - 866 ) ÷ 866] x 100 = -40.76%
Formula
Percentage change = [(513 - 866) / 866] x 100
Subtract the new number by the original number
513 - 866 = -353
-353 ÷ 866 = -0.407621247113164
-0.407621247113164 x 100 = -40.76%