-27.15% is the change from 917 to 668
Calculation steps:
[( 668 - 917 ) ÷ 917] x 100 = -27.15%
Formula
Percentage change = [(668 - 917) / 917] x 100
Subtract the new number by the original number
668 - 917 = -249
-249 ÷ 917 = -0.27153762268266085
-0.27153762268266085 x 100 = -27.15%