-25.6% is the change from 664 to 494
Calculation steps:
[( 494 - 664 ) ÷ 664] x 100 = -25.6%
Formula
Percentage change = [(494 - 664) / 664] x 100
Subtract the new number by the original number
494 - 664 = -170
-170 ÷ 664 = -0.2560240963855422
-0.2560240963855422 x 100 = -25.6%