-29.72% is the change from 646 to 454
Calculation steps:
[( 454 - 646 ) ÷ 646] x 100 = -29.72%
Formula
Percentage change = [(454 - 646) / 646] x 100
Subtract the new number by the original number
454 - 646 = -192
-192 ÷ 646 = -0.29721362229102166
-0.29721362229102166 x 100 = -29.72%