-57.28% is the change from 639 to 273
Calculation steps:
[( 273 - 639 ) ÷ 639] x 100 = -57.28%
Formula
Percentage change = [(273 - 639) / 639] x 100
Subtract the new number by the original number
273 - 639 = -366
-366 ÷ 639 = -0.5727699530516432
-0.5727699530516432 x 100 = -57.28%