-25.52% is the change from 670 to 499
Calculation steps:
[( 499 - 670 ) ÷ 670] x 100 = -25.52%
Formula
Percentage change = [(499 - 670) / 670] x 100
Subtract the new number by the original number
499 - 670 = -171
-171 ÷ 670 = -0.25522388059701495
-0.25522388059701495 x 100 = -25.52%