-34.5% is the change from 687 to 450
Calculation steps:
[( 450 - 687 ) ÷ 687] x 100 = -34.5%
Formula
Percentage change = [(450 - 687) / 687] x 100
Subtract the new number by the original number
450 - 687 = -237
-237 ÷ 687 = -0.34497816593886466
-0.34497816593886466 x 100 = -34.5%