-58.7% is the change from 966 to 399
Calculation steps:
[( 399 - 966 ) ÷ 966] x 100 = -58.7%
Formula
Percentage change = [(399 - 966) / 966] x 100
Subtract the new number by the original number
399 - 966 = -567
-567 ÷ 966 = -0.5869565217391305
-0.5869565217391305 x 100 = -58.7%