-75.75% is the change from 866 to 210
Calculation steps:
[( 210 - 866 ) ÷ 866] x 100 = -75.75%
Formula
Percentage change = [(210 - 866) / 866] x 100
Subtract the new number by the original number
210 - 866 = -656
-656 ÷ 866 = -0.7575057736720554
-0.7575057736720554 x 100 = -75.75%