-31.77% is the change from 979 to 668
Calculation steps:
[( 668 - 979 ) ÷ 979] x 100 = -31.77%
Formula
Percentage change = [(668 - 979) / 979] x 100
Subtract the new number by the original number
668 - 979 = -311
-311 ÷ 979 = -0.3176710929519918
-0.3176710929519918 x 100 = -31.77%