-30.82% is the change from 451 to 312
Calculation steps:
[( 312 - 451 ) ÷ 451] x 100 = -30.82%
Formula
Percentage change = [(312 - 451) / 451] x 100
Subtract the new number by the original number
312 - 451 = -139
-139 ÷ 451 = -0.3082039911308204
-0.3082039911308204 x 100 = -30.82%