-49.2% is the change from 435 to 221
Calculation steps:
[( 221 - 435 ) ÷ 435] x 100 = -49.2%
Formula
Percentage change = [(221 - 435) / 435] x 100
Subtract the new number by the original number
221 - 435 = -214
-214 ÷ 435 = -0.49195402298850577
-0.49195402298850577 x 100 = -49.2%