-18.37% is the change from 664 to 542
Calculation steps:
[( 542 - 664 ) ÷ 664] x 100 = -18.37%
Formula
Percentage change = [(542 - 664) / 664] x 100
Subtract the new number by the original number
542 - 664 = -122
-122 ÷ 664 = -0.18373493975903615
-0.18373493975903615 x 100 = -18.37%