-3.23% is the change from 991 to 959
Calculation steps:
[( 959 - 991 ) ÷ 991] x 100 = -3.23%
Formula
Percentage change = [(959 - 991) / 991] x 100
Subtract the new number by the original number
959 - 991 = -32
-32 ÷ 991 = -0.03229061553985873
-0.03229061553985873 x 100 = -3.23%