-94.01% is the change from 851 to 51
Calculation steps:
[( 51 - 851 ) ÷ 851] x 100 = -94.01%
Formula
Percentage change = [(51 - 851) / 851] x 100
Subtract the new number by the original number
51 - 851 = -800
-800 ÷ 851 = -0.9400705052878966
-0.9400705052878966 x 100 = -94.01%