-0.64% is the change from 313 to 311
Calculation steps:
[( 311 - 313 ) ÷ 313] x 100 = -0.64%
Formula
Percentage change = [(311 - 313) / 313] x 100
Subtract the new number by the original number
311 - 313 = -2
-2 ÷ 313 = -0.006389776357827476
-0.006389776357827476 x 100 = -0.64%