-93.9% is the change from 836 to 51
Calculation steps:
[( 51 - 836 ) ÷ 836] x 100 = -93.9%
Formula
Percentage change = [(51 - 836) / 836] x 100
Subtract the new number by the original number
51 - 836 = -785
-785 ÷ 836 = -0.9389952153110048
-0.9389952153110048 x 100 = -93.9%