-30.57% is the change from 494 to 343
Calculation steps:
[( 343 - 494 ) ÷ 494] x 100 = -30.57%
Formula
Percentage change = [(343 - 494) / 494] x 100
Subtract the new number by the original number
343 - 494 = -151
-151 ÷ 494 = -0.305668016194332
-0.305668016194332 x 100 = -30.57%