-59.68% is the change from 821 to 331
Calculation steps:
[( 331 - 821 ) ÷ 821] x 100 = -59.68%
Formula
Percentage change = [(331 - 821) / 821] x 100
Subtract the new number by the original number
331 - 821 = -490
-490 ÷ 821 = -0.5968331303288672
-0.5968331303288672 x 100 = -59.68%