-32.84% is the change from 670 to 450
Calculation steps:
[( 450 - 670 ) ÷ 670] x 100 = -32.84%
Formula
Percentage change = [(450 - 670) / 670] x 100
Subtract the new number by the original number
450 - 670 = -220
-220 ÷ 670 = -0.3283582089552239
-0.3283582089552239 x 100 = -32.84%