-50.43% is the change from 815 to 404
Calculation steps:
[( 404 - 815 ) ÷ 815] x 100 = -50.43%
Formula
Percentage change = [(404 - 815) / 815] x 100
Subtract the new number by the original number
404 - 815 = -411
-411 ÷ 815 = -0.5042944785276073
-0.5042944785276073 x 100 = -50.43%