-2.4% is the change from 999 to 975
Calculation steps:
[( 975 - 999 ) ÷ 999] x 100 = -2.4%
Formula
Percentage change = [(975 - 999) / 999] x 100
Subtract the new number by the original number
975 - 999 = -24
-24 ÷ 999 = -0.024024024024024024
-0.024024024024024024 x 100 = -2.4%