-76.44% is the change from 866 to 204
Calculation steps:
[( 204 - 866 ) ÷ 866] x 100 = -76.44%
Formula
Percentage change = [(204 - 866) / 866] x 100
Subtract the new number by the original number
204 - 866 = -662
-662 ÷ 866 = -0.7644341801385681
-0.7644341801385681 x 100 = -76.44%