-43.09% is the change from 687 to 391
Calculation steps:
[( 391 - 687 ) ÷ 687] x 100 = -43.09%
Formula
Percentage change = [(391 - 687) / 687] x 100
Subtract the new number by the original number
391 - 687 = -296
-296 ÷ 687 = -0.43085880640465796
-0.43085880640465796 x 100 = -43.09%