-29.86% is the change from 643 to 451
Calculation steps:
[( 451 - 643 ) ÷ 643] x 100 = -29.86%
Formula
Percentage change = [(451 - 643) / 643] x 100
Subtract the new number by the original number
451 - 643 = -192
-192 ÷ 643 = -0.2986003110419907
-0.2986003110419907 x 100 = -29.86%