-67.08% is the change from 638 to 210
Calculation steps:
[( 210 - 638 ) ÷ 638] x 100 = -67.08%
Formula
Percentage change = [(210 - 638) / 638] x 100
Subtract the new number by the original number
210 - 638 = -428
-428 ÷ 638 = -0.670846394984326
-0.670846394984326 x 100 = -67.08%