-51.56% is the change from 836 to 405
Calculation steps:
[( 405 - 836 ) ÷ 836] x 100 = -51.56%
Formula
Percentage change = [(405 - 836) / 836] x 100
Subtract the new number by the original number
405 - 836 = -431
-431 ÷ 836 = -0.5155502392344498
-0.5155502392344498 x 100 = -51.56%