-51.97% is the change from 939 to 451
Calculation steps:
[( 451 - 939 ) ÷ 939] x 100 = -51.97%
Formula
Percentage change = [(451 - 939) / 939] x 100
Subtract the new number by the original number
451 - 939 = -488
-488 ÷ 939 = -0.5197018104366348
-0.5197018104366348 x 100 = -51.97%