-38.6% is the change from 816 to 501
Calculation steps:
[( 501 - 816 ) ÷ 816] x 100 = -38.6%
Formula
Percentage change = [(501 - 816) / 816] x 100
Subtract the new number by the original number
501 - 816 = -315
-315 ÷ 816 = -0.3860294117647059
-0.3860294117647059 x 100 = -38.6%