-70.38% is the change from 638 to 189
Calculation steps:
[( 189 - 638 ) ÷ 638] x 100 = -70.38%
Formula
Percentage change = [(189 - 638) / 638] x 100
Subtract the new number by the original number
189 - 638 = -449
-449 ÷ 638 = -0.7037617554858934
-0.7037617554858934 x 100 = -70.38%