-59.47% is the change from 639 to 259
Calculation steps:
[( 259 - 639 ) ÷ 639] x 100 = -59.47%
Formula
Percentage change = [(259 - 639) / 639] x 100
Subtract the new number by the original number
259 - 639 = -380
-380 ÷ 639 = -0.594679186228482
-0.594679186228482 x 100 = -59.47%