-38.34% is the change from 866 to 534
Calculation steps:
[( 534 - 866 ) ÷ 866] x 100 = -38.34%
Formula
Percentage change = [(534 - 866) / 866] x 100
Subtract the new number by the original number
534 - 866 = -332
-332 ÷ 866 = -0.3833718244803695
-0.3833718244803695 x 100 = -38.34%