-47.37% is the change from 399 to 210
Calculation steps:
[( 210 - 399 ) ÷ 399] x 100 = -47.37%
Formula
Percentage change = [(210 - 399) / 399] x 100
Subtract the new number by the original number
210 - 399 = -189
-189 ÷ 399 = -0.47368421052631576
-0.47368421052631576 x 100 = -47.37%