-33.2% is the change from 991 to 662
Calculation steps:
[( 662 - 991 ) ÷ 991] x 100 = -33.2%
Formula
Percentage change = [(662 - 991) / 991] x 100
Subtract the new number by the original number
662 - 991 = -329
-329 ÷ 991 = -0.33198789101917253
-0.33198789101917253 x 100 = -33.2%