-74.33% is the change from 639 to 164
Calculation steps:
[( 164 - 639 ) ÷ 639] x 100 = -74.33%
Formula
Percentage change = [(164 - 639) / 639] x 100
Subtract the new number by the original number
164 - 639 = -475
-475 ÷ 639 = -0.7433489827856025
-0.7433489827856025 x 100 = -74.33%