-34.08% is the change from 490 to 323
Calculation steps:
[( 323 - 490 ) ÷ 490] x 100 = -34.08%
Formula
Percentage change = [(323 - 490) / 490] x 100
Subtract the new number by the original number
323 - 490 = -167
-167 ÷ 490 = -0.3408163265306122
-0.3408163265306122 x 100 = -34.08%