-51.17% is the change from 428 to 209
Calculation steps:
[( 209 - 428 ) ÷ 428] x 100 = -51.17%
Formula
Percentage change = [(209 - 428) / 428] x 100
Subtract the new number by the original number
209 - 428 = -219
-219 ÷ 428 = -0.5116822429906542
-0.5116822429906542 x 100 = -51.17%