-41.84% is the change from 686 to 399
Calculation steps:
[( 399 - 686 ) ÷ 686] x 100 = -41.84%
Formula
Percentage change = [(399 - 686) / 686] x 100
Subtract the new number by the original number
399 - 686 = -287
-287 ÷ 686 = -0.41836734693877553
-0.41836734693877553 x 100 = -41.84%