-51.78% is the change from 421 to 203
Calculation steps:
[( 203 - 421 ) ÷ 421] x 100 = -51.78%
Formula
Percentage change = [(203 - 421) / 421] x 100
Subtract the new number by the original number
203 - 421 = -218
-218 ÷ 421 = -0.517814726840855
-0.517814726840855 x 100 = -51.78%