-68.52% is the change from 991 to 312
Calculation steps:
[( 312 - 991 ) ÷ 991] x 100 = -68.52%
Formula
Percentage change = [(312 - 991) / 991] x 100
Subtract the new number by the original number
312 - 991 = -679
-679 ÷ 991 = -0.6851664984863775
-0.6851664984863775 x 100 = -68.52%