-60.61% is the change from 820 to 323
Calculation steps:
[( 323 - 820 ) ÷ 820] x 100 = -60.61%
Formula
Percentage change = [(323 - 820) / 820] x 100
Subtract the new number by the original number
323 - 820 = -497
-497 ÷ 820 = -0.6060975609756097
-0.6060975609756097 x 100 = -60.61%