-29.57% is the change from 646 to 455
Calculation steps:
[( 455 - 646 ) ÷ 646] x 100 = -29.57%
Formula
Percentage change = [(455 - 646) / 646] x 100
Subtract the new number by the original number
455 - 646 = -191
-191 ÷ 646 = -0.29566563467492263
-0.29566563467492263 x 100 = -29.57%