-52.33% is the change from 837 to 399
Calculation steps:
[( 399 - 837 ) ÷ 837] x 100 = -52.33%
Formula
Percentage change = [(399 - 837) / 837] x 100
Subtract the new number by the original number
399 - 837 = -438
-438 ÷ 837 = -0.5232974910394266
-0.5232974910394266 x 100 = -52.33%