-67.21% is the change from 866 to 284
Calculation steps:
[( 284 - 866 ) ÷ 866] x 100 = -67.21%
Formula
Percentage change = [(284 - 866) / 866] x 100
Subtract the new number by the original number
284 - 866 = -582
-582 ÷ 866 = -0.6720554272517321
-0.6720554272517321 x 100 = -67.21%