-38.82% is the change from 644 to 394
Calculation steps:
[( 394 - 644 ) ÷ 644] x 100 = -38.82%
Formula
Percentage change = [(394 - 644) / 644] x 100
Subtract the new number by the original number
394 - 644 = -250
-250 ÷ 644 = -0.38819875776397517
-0.38819875776397517 x 100 = -38.82%