-51.67% is the change from 807 to 390
Calculation steps:
[( 390 - 807 ) ÷ 807] x 100 = -51.67%
Formula
Percentage change = [(390 - 807) / 807] x 100
Subtract the new number by the original number
390 - 807 = -417
-417 ÷ 807 = -0.516728624535316
-0.516728624535316 x 100 = -51.67%