-31.86% is the change from 499 to 340
Calculation steps:
[( 340 - 499 ) ÷ 499] x 100 = -31.86%
Formula
Percentage change = [(340 - 499) / 499] x 100
Subtract the new number by the original number
340 - 499 = -159
-159 ÷ 499 = -0.3186372745490982
-0.3186372745490982 x 100 = -31.86%