-5.5% is the change from 327 to 309
Calculation steps:
[( 309 - 327 ) ÷ 327] x 100 = -5.5%
Formula
Percentage change = [(309 - 327) / 327] x 100
Subtract the new number by the original number
309 - 327 = -18
-18 ÷ 327 = -0.05504587155963303
-0.05504587155963303 x 100 = -5.5%