-45.9% is the change from 390 to 211
Calculation steps:
[( 211 - 390 ) ÷ 390] x 100 = -45.9%
Formula
Percentage change = [(211 - 390) / 390] x 100
Subtract the new number by the original number
211 - 390 = -179
-179 ÷ 390 = -0.45897435897435895
-0.45897435897435895 x 100 = -45.9%