-11.11% is the change from 18 to 16
Calculation steps:
[( 16 - 18 ) ÷ 18] x 100 = -11.11%
Formula
Percentage change = [(16 - 18) / 18] x 100
Subtract the new number by the original number
16 - 18 = -2
-2 ÷ 18 = -0.1111111111111111
-0.1111111111111111 x 100 = -11.11%