-47.62% is the change from 399 to 209
Calculation steps:
[( 209 - 399 ) ÷ 399] x 100 = -47.62%
Formula
Percentage change = [(209 - 399) / 399] x 100
Subtract the new number by the original number
209 - 399 = -190
-190 ÷ 399 = -0.47619047619047616
-0.47619047619047616 x 100 = -47.62%