-55.39% is the change from 686 to 306
Calculation steps:
[( 306 - 686 ) ÷ 686] x 100 = -55.39%
Formula
Percentage change = [(306 - 686) / 686] x 100
Subtract the new number by the original number
306 - 686 = -380
-380 ÷ 686 = -0.5539358600583091
-0.5539358600583091 x 100 = -55.39%