-39.73% is the change from 662 to 399
Calculation steps:
[( 399 - 662 ) ÷ 662] x 100 = -39.73%
Formula
Percentage change = [(399 - 662) / 662] x 100
Subtract the new number by the original number
399 - 662 = -263
-263 ÷ 662 = -0.3972809667673716
-0.3972809667673716 x 100 = -39.73%