-29.11% is the change from 931 to 660
Calculation steps:
[( 660 - 931 ) ÷ 931] x 100 = -29.11%
Formula
Percentage change = [(660 - 931) / 931] x 100
Subtract the new number by the original number
660 - 931 = -271
-271 ÷ 931 = -0.29108485499462944
-0.29108485499462944 x 100 = -29.11%