-9.06% is the change from 342 to 311
Calculation steps:
[( 311 - 342 ) ÷ 342] x 100 = -9.06%
Formula
Percentage change = [(311 - 342) / 342] x 100
Subtract the new number by the original number
311 - 342 = -31
-31 ÷ 342 = -0.09064327485380116
-0.09064327485380116 x 100 = -9.06%