-42.17% is the change from 690 to 399
Calculation steps:
[( 399 - 690 ) ÷ 690] x 100 = -42.17%
Formula
Percentage change = [(399 - 690) / 690] x 100
Subtract the new number by the original number
399 - 690 = -291
-291 ÷ 690 = -0.4217391304347826
-0.4217391304347826 x 100 = -42.17%