-62% is the change from 821 to 312
Calculation steps:
[( 312 - 821 ) ÷ 821] x 100 = -62%
Formula
Percentage change = [(312 - 821) / 821] x 100
Subtract the new number by the original number
312 - 821 = -509
-509 ÷ 821 = -0.6199756394640682
-0.6199756394640682 x 100 = -62%