-74.6% is the change from 866 to 220
Calculation steps:
[( 220 - 866 ) ÷ 866] x 100 = -74.6%
Formula
Percentage change = [(220 - 866) / 866] x 100
Subtract the new number by the original number
220 - 866 = -646
-646 ÷ 866 = -0.745958429561201
-0.745958429561201 x 100 = -74.6%