-84.19% is the change from 664 to 105
Calculation steps:
[( 105 - 664 ) ÷ 664] x 100 = -84.19%
Formula
Percentage change = [(105 - 664) / 664] x 100
Subtract the new number by the original number
105 - 664 = -559
-559 ÷ 664 = -0.8418674698795181
-0.8418674698795181 x 100 = -84.19%