-92.51% is the change from 855 to 64
Calculation steps:
[( 64 - 855 ) ÷ 855] x 100 = -92.51%
Formula
Percentage change = [(64 - 855) / 855] x 100
Subtract the new number by the original number
64 - 855 = -791
-791 ÷ 855 = -0.9251461988304094
-0.9251461988304094 x 100 = -92.51%