-61.19% is the change from 639 to 248
Calculation steps:
[( 248 - 639 ) ÷ 639] x 100 = -61.19%
Formula
Percentage change = [(248 - 639) / 639] x 100
Subtract the new number by the original number
248 - 639 = -391
-391 ÷ 639 = -0.6118935837245696
-0.6118935837245696 x 100 = -61.19%