-77.02% is the change from 866 to 199
Calculation steps:
[( 199 - 866 ) ÷ 866] x 100 = -77.02%
Formula
Percentage change = [(199 - 866) / 866] x 100
Subtract the new number by the original number
199 - 866 = -667
-667 ÷ 866 = -0.7702078521939953
-0.7702078521939953 x 100 = -77.02%