-51.69% is the change from 826 to 399
Calculation steps:
[( 399 - 826 ) ÷ 826] x 100 = -51.69%
Formula
Percentage change = [(399 - 826) / 826] x 100
Subtract the new number by the original number
399 - 826 = -427
-427 ÷ 826 = -0.5169491525423728
-0.5169491525423728 x 100 = -51.69%