-94.17% is the change from 686 to 40
Calculation steps:
[( 40 - 686 ) ÷ 686] x 100 = -94.17%
Formula
Percentage change = [(40 - 686) / 686] x 100
Subtract the new number by the original number
40 - 686 = -646
-646 ÷ 686 = -0.9416909620991254
-0.9416909620991254 x 100 = -94.17%