-80.06% is the change from 647 to 129
Calculation steps:
[( 129 - 647 ) ÷ 647] x 100 = -80.06%
Formula
Percentage change = [(129 - 647) / 647] x 100
Subtract the new number by the original number
129 - 647 = -518
-518 ÷ 647 = -0.8006182380216383
-0.8006182380216383 x 100 = -80.06%