-25% is the change from 664 to 498
Calculation steps:
[( 498 - 664 ) ÷ 664] x 100 = -25%
Formula
Percentage change = [(498 - 664) / 664] x 100
Subtract the new number by the original number
498 - 664 = -166
-166 ÷ 664 = -0.25
-0.25 x 100 = -25%
Example