-41.34% is the change from 866 to 508
Calculation steps:
[( 508 - 866 ) ÷ 866] x 100 = -41.34%
Formula
Percentage change = [(508 - 866) / 866] x 100
Subtract the new number by the original number
508 - 866 = -358
-358 ÷ 866 = -0.4133949191685912
-0.4133949191685912 x 100 = -41.34%