-6.36% is the change from 991 to 928
Calculation steps:
[( 928 - 991 ) ÷ 991] x 100 = -6.36%
Formula
Percentage change = [(928 - 991) / 991] x 100
Subtract the new number by the original number
928 - 991 = -63
-63 ÷ 991 = -0.06357214934409687
-0.06357214934409687 x 100 = -6.36%