-55.09% is the change from 639 to 287
Calculation steps:
[( 287 - 639 ) ÷ 639] x 100 = -55.09%
Formula
Percentage change = [(287 - 639) / 639] x 100
Subtract the new number by the original number
287 - 639 = -352
-352 ÷ 639 = -0.5508607198748043
-0.5508607198748043 x 100 = -55.09%