-20.18% is the change from 664 to 530
Calculation steps:
[( 530 - 664 ) ÷ 664] x 100 = -20.18%
Formula
Percentage change = [(530 - 664) / 664] x 100
Subtract the new number by the original number
530 - 664 = -134
-134 ÷ 664 = -0.20180722891566266
-0.20180722891566266 x 100 = -20.18%