-75.64% is the change from 866 to 211
Calculation steps:
[( 211 - 866 ) ÷ 866] x 100 = -75.64%
Formula
Percentage change = [(211 - 866) / 866] x 100
Subtract the new number by the original number
211 - 866 = -655
-655 ÷ 866 = -0.75635103926097
-0.75635103926097 x 100 = -75.64%