-30.2% is the change from 957 to 668
Calculation steps:
[( 668 - 957 ) ÷ 957] x 100 = -30.2%
Formula
Percentage change = [(668 - 957) / 957] x 100
Subtract the new number by the original number
668 - 957 = -289
-289 ÷ 957 = -0.3019853709508882
-0.3019853709508882 x 100 = -30.2%