-50% is the change from 814 to 407
Calculation steps:
[( 407 - 814 ) ÷ 814] x 100 = -50%
Formula
Percentage change = [(407 - 814) / 814] x 100
Subtract the new number by the original number
407 - 814 = -407
-407 ÷ 814 = -0.5
-0.5 x 100 = -50%
Example