-3.33% is the change from 991 to 958
Calculation steps:
[( 958 - 991 ) ÷ 991] x 100 = -3.33%
Formula
Percentage change = [(958 - 991) / 991] x 100
Subtract the new number by the original number
958 - 991 = -33
-33 ÷ 991 = -0.033299697275479316
-0.033299697275479316 x 100 = -3.33%