-74.78% is the change from 686 to 173
Calculation steps:
[( 173 - 686 ) ÷ 686] x 100 = -74.78%
Formula
Percentage change = [(173 - 686) / 686] x 100
Subtract the new number by the original number
173 - 686 = -513
-513 ÷ 686 = -0.7478134110787172
-0.7478134110787172 x 100 = -74.78%