-0.99% is the change from 403 to 399
Calculation steps:
[( 399 - 403 ) ÷ 403] x 100 = -0.99%
Formula
Percentage change = [(399 - 403) / 403] x 100
Subtract the new number by the original number
399 - 403 = -4
-4 ÷ 403 = -0.009925558312655087
-0.009925558312655087 x 100 = -0.99%