-1.93% is the change from 311 to 305
Calculation steps:
[( 305 - 311 ) ÷ 311] x 100 = -1.93%
Formula
Percentage change = [(305 - 311) / 311] x 100
Subtract the new number by the original number
305 - 311 = -6
-6 ÷ 311 = -0.01929260450160772
-0.01929260450160772 x 100 = -1.93%