-7.78% is the change from 990 to 913
Calculation steps:
[( 913 - 990 ) ÷ 990] x 100 = -7.78%
Formula
Percentage change = [(913 - 990) / 990] x 100
Subtract the new number by the original number
913 - 990 = -77
-77 ÷ 990 = -0.07777777777777778
-0.07777777777777778 x 100 = -7.78%