-52.27% is the change from 836 to 399
Calculation steps:
[( 399 - 836 ) ÷ 836] x 100 = -52.27%
Formula
Percentage change = [(399 - 836) / 836] x 100
Subtract the new number by the original number
399 - 836 = -437
-437 ÷ 836 = -0.5227272727272727
-0.5227272727272727 x 100 = -52.27%