-50.73% is the change from 686 to 338
Calculation steps:
[( 338 - 686 ) ÷ 686] x 100 = -50.73%
Formula
Percentage change = [(338 - 686) / 686] x 100
Subtract the new number by the original number
338 - 686 = -348
-348 ÷ 686 = -0.5072886297376094
-0.5072886297376094 x 100 = -50.73%