-31.59% is the change from 497 to 340
Calculation steps:
[( 340 - 497 ) ÷ 497] x 100 = -31.59%
Formula
Percentage change = [(340 - 497) / 497] x 100
Subtract the new number by the original number
340 - 497 = -157
-157 ÷ 497 = -0.3158953722334004
-0.3158953722334004 x 100 = -31.59%