-93.27% is the change from 639 to 43
Calculation steps:
[( 43 - 639 ) ÷ 639] x 100 = -93.27%
Formula
Percentage change = [(43 - 639) / 639] x 100
Subtract the new number by the original number
43 - 639 = -596
-596 ÷ 639 = -0.9327073552425665
-0.9327073552425665 x 100 = -93.27%