-1.2% is the change from 999 to 987
Calculation steps:
[( 987 - 999 ) ÷ 999] x 100 = -1.2%
Formula
Percentage change = [(987 - 999) / 999] x 100
Subtract the new number by the original number
987 - 999 = -12
-12 ÷ 999 = -0.012012012012012012
-0.012012012012012012 x 100 = -1.2%