-39.09% is the change from 816 to 497
Calculation steps:
[( 497 - 816 ) ÷ 816] x 100 = -39.09%
Formula
Percentage change = [(497 - 816) / 816] x 100
Subtract the new number by the original number
497 - 816 = -319
-319 ÷ 816 = -0.3909313725490196
-0.3909313725490196 x 100 = -39.09%