-31.19% is the change from 497 to 342
Calculation steps:
[( 342 - 497 ) ÷ 497] x 100 = -31.19%
Formula
Percentage change = [(342 - 497) / 497] x 100
Subtract the new number by the original number
342 - 497 = -155
-155 ÷ 497 = -0.3118712273641851
-0.3118712273641851 x 100 = -31.19%