-30.92% is the change from 566 to 391
Calculation steps:
[( 391 - 566 ) ÷ 566] x 100 = -30.92%
Formula
Percentage change = [(391 - 566) / 566] x 100
Subtract the new number by the original number
391 - 566 = -175
-175 ÷ 566 = -0.30918727915194344
-0.30918727915194344 x 100 = -30.92%