-56.81% is the change from 639 to 276
Calculation steps:
[( 276 - 639 ) ÷ 639] x 100 = -56.81%
Formula
Percentage change = [(276 - 639) / 639] x 100
Subtract the new number by the original number
276 - 639 = -363
-363 ÷ 639 = -0.568075117370892
-0.568075117370892 x 100 = -56.81%