-49.85% is the change from 686 to 344
Calculation steps:
[( 344 - 686 ) ÷ 686] x 100 = -49.85%
Formula
Percentage change = [(344 - 686) / 686] x 100
Subtract the new number by the original number
344 - 686 = -342
-342 ÷ 686 = -0.49854227405247814
-0.49854227405247814 x 100 = -49.85%