-49.1% is the change from 611 to 311
Calculation steps:
[( 311 - 611 ) ÷ 611] x 100 = -49.1%
Formula
Percentage change = [(311 - 611) / 611] x 100
Subtract the new number by the original number
311 - 611 = -300
-300 ÷ 611 = -0.4909983633387889
-0.4909983633387889 x 100 = -49.1%