-51.78% is the change from 450 to 217
Calculation steps:
[( 217 - 450 ) ÷ 450] x 100 = -51.78%
Formula
Percentage change = [(217 - 450) / 450] x 100
Subtract the new number by the original number
217 - 450 = -233
-233 ÷ 450 = -0.5177777777777778
-0.5177777777777778 x 100 = -51.78%