-49.45% is the change from 819 to 414
Calculation steps:
[( 414 - 819 ) ÷ 819] x 100 = -49.45%
Formula
Percentage change = [(414 - 819) / 819] x 100
Subtract the new number by the original number
414 - 819 = -405
-405 ÷ 819 = -0.4945054945054945
-0.4945054945054945 x 100 = -49.45%