-79.82% is the change from 664 to 134
Calculation steps:
[( 134 - 664 ) ÷ 664] x 100 = -79.82%
Formula
Percentage change = [(134 - 664) / 664] x 100
Subtract the new number by the original number
134 - 664 = -530
-530 ÷ 664 = -0.7981927710843374
-0.7981927710843374 x 100 = -79.82%