-6.31% is the change from 999 to 936
Calculation steps:
[( 936 - 999 ) ÷ 999] x 100 = -6.31%
Formula
Percentage change = [(936 - 999) / 999] x 100
Subtract the new number by the original number
936 - 999 = -63
-63 ÷ 999 = -0.06306306306306306
-0.06306306306306306 x 100 = -6.31%