-32.69% is the change from 991 to 667
Calculation steps:
[( 667 - 991 ) ÷ 991] x 100 = -32.69%
Formula
Percentage change = [(667 - 991) / 991] x 100
Subtract the new number by the original number
667 - 991 = -324
-324 ÷ 991 = -0.32694248234106965
-0.32694248234106965 x 100 = -32.69%