-37.75% is the change from 816 to 508
Calculation steps:
[( 508 - 816 ) ÷ 816] x 100 = -37.75%
Formula
Percentage change = [(508 - 816) / 816] x 100
Subtract the new number by the original number
508 - 816 = -308
-308 ÷ 816 = -0.37745098039215685
-0.37745098039215685 x 100 = -37.75%