-30.34% is the change from 646 to 450
Calculation steps:
[( 450 - 646 ) ÷ 646] x 100 = -30.34%
Formula
Percentage change = [(450 - 646) / 646] x 100
Subtract the new number by the original number
450 - 646 = -196
-196 ÷ 646 = -0.30340557275541796
-0.30340557275541796 x 100 = -30.34%