-34.9% is the change from 490 to 319
Calculation steps:
[( 319 - 490 ) ÷ 490] x 100 = -34.9%
Formula
Percentage change = [(319 - 490) / 490] x 100
Subtract the new number by the original number
319 - 490 = -171
-171 ÷ 490 = -0.3489795918367347
-0.3489795918367347 x 100 = -34.9%