-93.8% is the change from 823 to 51
Calculation steps:
[( 51 - 823 ) ÷ 823] x 100 = -93.8%
Formula
Percentage change = [(51 - 823) / 823] x 100
Subtract the new number by the original number
51 - 823 = -772
-772 ÷ 823 = -0.9380315917375456
-0.9380315917375456 x 100 = -93.8%