-37.99% is the change from 816 to 506
Calculation steps:
[( 506 - 816 ) ÷ 816] x 100 = -37.99%
Formula
Percentage change = [(506 - 816) / 816] x 100
Subtract the new number by the original number
506 - 816 = -310
-310 ÷ 816 = -0.3799019607843137
-0.3799019607843137 x 100 = -37.99%