-46% is the change from 850 to 459
Calculation steps:
[( 459 - 850 ) ÷ 850] x 100 = -46%
Formula
Percentage change = [(459 - 850) / 850] x 100
Subtract the new number by the original number
459 - 850 = -391
-391 ÷ 850 = -0.46
-0.46 x 100 = -46%
Example