-78.57% is the change from 686 to 147
Calculation steps:
[( 147 - 686 ) ÷ 686] x 100 = -78.57%
Formula
Percentage change = [(147 - 686) / 686] x 100
Subtract the new number by the original number
147 - 686 = -539
-539 ÷ 686 = -0.7857142857142857
-0.7857142857142857 x 100 = -78.57%