-51.93% is the change from 647 to 311
Calculation steps:
[( 311 - 647 ) ÷ 647] x 100 = -51.93%
Formula
Percentage change = [(311 - 647) / 647] x 100
Subtract the new number by the original number
311 - 647 = -336
-336 ÷ 647 = -0.5193199381761978
-0.5193199381761978 x 100 = -51.93%