-60.68% is the change from 646 to 254
Calculation steps:
[( 254 - 646 ) ÷ 646] x 100 = -60.68%
Formula
Percentage change = [(254 - 646) / 646] x 100
Subtract the new number by the original number
254 - 646 = -392
-392 ÷ 646 = -0.6068111455108359
-0.6068111455108359 x 100 = -60.68%