-56.59% is the change from 668 to 290
Calculation steps:
[( 290 - 668 ) ÷ 668] x 100 = -56.59%
Formula
Percentage change = [(290 - 668) / 668] x 100
Subtract the new number by the original number
290 - 668 = -378
-378 ÷ 668 = -0.5658682634730539
-0.5658682634730539 x 100 = -56.59%