-31.2% is the change from 971 to 668
Calculation steps:
[( 668 - 971 ) ÷ 971] x 100 = -31.2%
Formula
Percentage change = [(668 - 971) / 971] x 100
Subtract the new number by the original number
668 - 971 = -303
-303 ÷ 971 = -0.3120494335736354
-0.3120494335736354 x 100 = -31.2%