-94.11% is the change from 866 to 51
Calculation steps:
[( 51 - 866 ) ÷ 866] x 100 = -94.11%
Formula
Percentage change = [(51 - 866) / 866] x 100
Subtract the new number by the original number
51 - 866 = -815
-815 ÷ 866 = -0.941108545034642
-0.941108545034642 x 100 = -94.11%