-49.88% is the change from 866 to 434
Calculation steps:
[( 434 - 866 ) ÷ 866] x 100 = -49.88%
Formula
Percentage change = [(434 - 866) / 866] x 100
Subtract the new number by the original number
434 - 866 = -432
-432 ÷ 866 = -0.49884526558891457
-0.49884526558891457 x 100 = -49.88%