-34.64% is the change from 664 to 434
Calculation steps:
[( 434 - 664 ) ÷ 664] x 100 = -34.64%
Formula
Percentage change = [(434 - 664) / 664] x 100
Subtract the new number by the original number
434 - 664 = -230
-230 ÷ 664 = -0.3463855421686747
-0.3463855421686747 x 100 = -34.64%