-60.66% is the change from 816 to 321
Calculation steps:
[( 321 - 816 ) ÷ 816] x 100 = -60.66%
Formula
Percentage change = [(321 - 816) / 816] x 100
Subtract the new number by the original number
321 - 816 = -495
-495 ÷ 816 = -0.6066176470588235
-0.6066176470588235 x 100 = -60.66%