-45.11% is the change from 931 to 511
Calculation steps:
[( 511 - 931 ) ÷ 931] x 100 = -45.11%
Formula
Percentage change = [(511 - 931) / 931] x 100
Subtract the new number by the original number
511 - 931 = -420
-420 ÷ 931 = -0.45112781954887216
-0.45112781954887216 x 100 = -45.11%