-13.18% is the change from 311 to 270
Calculation steps:
[( 270 - 311 ) ÷ 311] x 100 = -13.18%
Formula
Percentage change = [(270 - 311) / 311] x 100
Subtract the new number by the original number
270 - 311 = -41
-41 ÷ 311 = -0.13183279742765272
-0.13183279742765272 x 100 = -13.18%