-19.58% is the change from 664 to 534
Calculation steps:
[( 534 - 664 ) ÷ 664] x 100 = -19.58%
Formula
Percentage change = [(534 - 664) / 664] x 100
Subtract the new number by the original number
534 - 664 = -130
-130 ÷ 664 = -0.19578313253012047
-0.19578313253012047 x 100 = -19.58%