-17.32% is the change from 664 to 549
Calculation steps:
[( 549 - 664 ) ÷ 664] x 100 = -17.32%
Formula
Percentage change = [(549 - 664) / 664] x 100
Subtract the new number by the original number
549 - 664 = -115
-115 ÷ 664 = -0.17319277108433734
-0.17319277108433734 x 100 = -17.32%