-6.87% is the change from 451 to 420
Calculation steps:
[( 420 - 451 ) ÷ 451] x 100 = -6.87%
Formula
Percentage change = [(420 - 451) / 451] x 100
Subtract the new number by the original number
420 - 451 = -31
-31 ÷ 451 = -0.06873614190687362
-0.06873614190687362 x 100 = -6.87%