-0.55% is the change from 181 to 180
Calculation steps:
[( 180 - 181 ) ÷ 181] x 100 = -0.55%
Formula
Percentage change = [(180 - 181) / 181] x 100
Subtract the new number by the original number
180 - 181 = -1
-1 ÷ 181 = -0.0055248618784530384
-0.0055248618784530384 x 100 = -0.55%