-80.39% is the change from 668 to 131
Calculation steps:
[( 131 - 668 ) ÷ 668] x 100 = -80.39%
Formula
Percentage change = [(131 - 668) / 668] x 100
Subtract the new number by the original number
131 - 668 = -537
-537 ÷ 668 = -0.8038922155688623
-0.8038922155688623 x 100 = -80.39%