-3.19% is the change from 690 to 668
Calculation steps:
[( 668 - 690 ) ÷ 690] x 100 = -3.19%
Formula
Percentage change = [(668 - 690) / 690] x 100
Subtract the new number by the original number
668 - 690 = -22
-22 ÷ 690 = -0.03188405797101449
-0.03188405797101449 x 100 = -3.19%