-50.07% is the change from 685 to 342
Calculation steps:
[( 342 - 685 ) ÷ 685] x 100 = -50.07%
Formula
Percentage change = [(342 - 685) / 685] x 100
Subtract the new number by the original number
342 - 685 = -343
-343 ÷ 685 = -0.5007299270072992
-0.5007299270072992 x 100 = -50.07%