-29.02% is the change from 479 to 340
Calculation steps:
[( 340 - 479 ) ÷ 479] x 100 = -29.02%
Formula
Percentage change = [(340 - 479) / 479] x 100
Subtract the new number by the original number
340 - 479 = -139
-139 ÷ 479 = -0.29018789144050106
-0.29018789144050106 x 100 = -29.02%