-41.69% is the change from 866 to 505
Calculation steps:
[( 505 - 866 ) ÷ 866] x 100 = -41.69%
Formula
Percentage change = [(505 - 866) / 866] x 100
Subtract the new number by the original number
505 - 866 = -361
-361 ÷ 866 = -0.4168591224018476
-0.4168591224018476 x 100 = -41.69%