-36.49% is the change from 866 to 550
Calculation steps:
[( 550 - 866 ) ÷ 866] x 100 = -36.49%
Formula
Percentage change = [(550 - 866) / 866] x 100
Subtract the new number by the original number
550 - 866 = -316
-316 ÷ 866 = -0.3648960739030023
-0.3648960739030023 x 100 = -36.49%