-20.09% is the change from 647 to 517
Calculation steps:
[( 517 - 647 ) ÷ 647] x 100 = -20.09%
Formula
Percentage change = [(517 - 647) / 647] x 100
Subtract the new number by the original number
517 - 647 = -130
-130 ÷ 647 = -0.2009273570324575
-0.2009273570324575 x 100 = -20.09%