-92.8% is the change from 639 to 46
Calculation steps:
[( 46 - 639 ) ÷ 639] x 100 = -92.8%
Formula
Percentage change = [(46 - 639) / 639] x 100
Subtract the new number by the original number
46 - 639 = -593
-593 ÷ 639 = -0.9280125195618153
-0.9280125195618153 x 100 = -92.8%