-34.09% is the change from 399 to 263
Calculation steps:
[( 263 - 399 ) ÷ 399] x 100 = -34.09%
Formula
Percentage change = [(263 - 399) / 399] x 100
Subtract the new number by the original number
263 - 399 = -136
-136 ÷ 399 = -0.3408521303258145
-0.3408521303258145 x 100 = -34.09%