-78.52% is the change from 647 to 139
Calculation steps:
[( 139 - 647 ) ÷ 647] x 100 = -78.52%
Formula
Percentage change = [(139 - 647) / 647] x 100
Subtract the new number by the original number
139 - 647 = -508
-508 ÷ 647 = -0.7851622874806801
-0.7851622874806801 x 100 = -78.52%