-50.12% is the change from 812 to 405
Calculation steps:
[( 405 - 812 ) ÷ 812] x 100 = -50.12%
Formula
Percentage change = [(405 - 812) / 812] x 100
Subtract the new number by the original number
405 - 812 = -407
-407 ÷ 812 = -0.5012315270935961
-0.5012315270935961 x 100 = -50.12%