-1.21% is the change from 331 to 327
Calculation steps:
[( 327 - 331 ) ÷ 331] x 100 = -1.21%
Formula
Percentage change = [(327 - 331) / 331] x 100
Subtract the new number by the original number
327 - 331 = -4
-4 ÷ 331 = -0.012084592145015106
-0.012084592145015106 x 100 = -1.21%