-3.11% is the change from 931 to 902
Calculation steps:
[( 902 - 931 ) ÷ 931] x 100 = -3.11%
Formula
Percentage change = [(902 - 931) / 931] x 100
Subtract the new number by the original number
902 - 931 = -29
-29 ÷ 931 = -0.031149301825993556
-0.031149301825993556 x 100 = -3.11%