-7.63% is the change from 668 to 617
Calculation steps:
[( 617 - 668 ) ÷ 668] x 100 = -7.63%
Formula
Percentage change = [(617 - 668) / 668] x 100
Subtract the new number by the original number
617 - 668 = -51
-51 ÷ 668 = -0.07634730538922156
-0.07634730538922156 x 100 = -7.63%