-51.07% is the change from 421 to 206
Calculation steps:
[( 206 - 421 ) ÷ 421] x 100 = -51.07%
Formula
Percentage change = [(206 - 421) / 421] x 100
Subtract the new number by the original number
206 - 421 = -215
-215 ÷ 421 = -0.5106888361045131
-0.5106888361045131 x 100 = -51.07%