-68.48% is the change from 990 to 312
Calculation steps:
[( 312 - 990 ) ÷ 990] x 100 = -68.48%
Formula
Percentage change = [(312 - 990) / 990] x 100
Subtract the new number by the original number
312 - 990 = -678
-678 ÷ 990 = -0.6848484848484848
-0.6848484848484848 x 100 = -68.48%