-93.77% is the change from 819 to 51
Calculation steps:
[( 51 - 819 ) ÷ 819] x 100 = -93.77%
Formula
Percentage change = [(51 - 819) / 819] x 100
Subtract the new number by the original number
51 - 819 = -768
-768 ÷ 819 = -0.9377289377289377
-0.9377289377289377 x 100 = -93.77%