-91.57% is the change from 866 to 73
Calculation steps:
[( 73 - 866 ) ÷ 866] x 100 = -91.57%
Formula
Percentage change = [(73 - 866) / 866] x 100
Subtract the new number by the original number
73 - 866 = -793
-793 ÷ 866 = -0.9157043879907621
-0.9157043879907621 x 100 = -91.57%