-41.32% is the change from 680 to 399
Calculation steps:
[( 399 - 680 ) ÷ 680] x 100 = -41.32%
Formula
Percentage change = [(399 - 680) / 680] x 100
Subtract the new number by the original number
399 - 680 = -281
-281 ÷ 680 = -0.41323529411764703
-0.41323529411764703 x 100 = -41.32%